1. Introduction
STEM (science, technology, engineering and mathematics) careers have drawn increasing interest over the years. The study of and work in these fields is a necessity in this globalized and competitive world with constant innovation and changing needs [
1], in which STEM careers are becoming more relevant [
2,
3,
4]. However, the number of students who select STEM careers is currently insufficient to fill the positions in the STEM job market, which is growing [
5]. Therefore, it is critical to increase the number of students pursuing STEM pathways [
4].
A gender gap in participation in these degrees has been observed [
6], especially in professions that tend to be male dominated, with a large technological, scientific and mathematical component [
7,
8], but these gender-based differences in scientific, specifically mathematic, performance have diminished in the last few years in various countries [
9,
10].
It has been stated that teaching mathematics has become an arduous task [
11] and that, for most people, learning mathematics is difficult because of how unstable the variables are [
12]. Research has shown that student interest is one of the main factors contributing to students’ selection of STEM courses [
13] and STEM-related fields [
14,
15], and adolescents with interests and talents in mathematics are more likely to pursue STEM in postsecondary education [
16,
17,
18,
19], so trying to increase students’ interest in STEM in general and in mathematics specifically could be important today [
20,
21].
In the same way, studies have shown that students’ mathematical self-efficacy is related to their interest in STEM careers; more specifically, some variables, such as self-efficacy in mathematics, mathematics achievement and success, play a critical role in influencing students’ interest in STEM careers [
4,
21,
22,
23,
24].
Nevertheless, there are cultural and social factors that suggest that gender stereotypes assign certain abilities or qualities to the sexes. According to [
25], gender stereotypes in our society are established and linked to learning capabilities. For example, some believe that girls are not good at mathematics and boys are, that girls like art but boys should not enjoy it or that boys should play sports and girls should not.
These sociocultural factors make us associate different traits and attitudes to men and women since childhood, making us assign to each gender certain stereotypes and conferring a selection of behaviours, roles and activities to both genders [
26,
27].
Regarding the latter, many investigations have shown that children believe mathematical-performance stereotypes. Children between 5 and 6 years old already display gender stereotypes related to mathematic performance and attitudes that suggest that males are more competent [
28,
29].
Refs. [
30,
31] found gender-based differences in mathematical success. After investigating affective variables and beliefs, such as complaints about the usefulness of and confidence in learning this subject, they proved that men showed higher confidence and stated that mathematics was more useful for them than for women. According to [
12], this idea has remained prevalent in more recent studies. High school students of both sexes believe that boys need more mathematical knowledge than girls to obtain successful jobs and have a better adult life.
In addition to the pattern based on a general perception of males’ greater mathematical competence, they perceive that success in this subject is purely based on ability and that praise regarding mathematics in an academic context will create a successful life for them in the future. Girls, on the other hand, show a lack of confidence in future achievements, a smaller social impact of their grades (based on whether their teachers like them) and an inferior self-concept of their mathematical competence [
12]. This attitudinal pattern, related to males’ superiority and ease compared to that of females in mathematics, is also observed among female high school students. Ref. [
32] found that the female gender has a large effect on success and failure attribution based on ability.
Nonetheless, not every study supports this idea of male dominance, and some show discordant results, pointing out that there is no evidence of gender-based differences in performance [
9,
33] or attitude [
34]. Moreover, [
35] stated that women showed more of a positive attitude towards mathematics than men.
The Programme for International Student Assessment, specifically the results regarding mathematical competence, show that the margin in gender-based differences has decreased in every edition. For example, in 2015, the difference between the sexes was 3.23%, favouring males; meanwhile, in 2018, it was 1.65%, favouring males. This shows that in Spain, this difference regarding mathematics exists but is decreasing over time [
36].
The existence of cognitive differences between the sexes has been frequently studied over the last few years, with a great variety of studies showing a clear difference in cognitive abilities between the sexes. Women stand out in verbal ability [
37] and input rate [
38], whereas men stand out in spatial ability [
38,
39] and mathematics [
40,
41].
Nonetheless, investigations have shown that said cognitive ability differences between the sexes have more to do with cultural differences [
33,
42,
43,
44,
45] and the effects of socialization more than anatomy, physiological nature or cognition.
On the other hand, we must consider the role that intelligence can play in the attitudes towards mathematics, which is why high-ability students may have a different attitude towards this subject. It should be emphasised that one of these students’ main characteristics is precisely their remarkable skills, whether intellectual, social, motor, mechanic or artistic [
46,
47,
48], when said abilities are compared to those of their peers [
49].
A study on high-ability students showed that academic success could be explained, in a way, by the intellectual ability they possess [
2,
50,
51] as well as the attitude and motivation they present while learning the subject [
52,
53,
54,
55]. However, the investigation presents other factors that affect their attitudes towards mathematics, such as the type of teachers they have [
56,
57,
58] and their family environment [
59,
60].
That is why it is interesting to observe whether gender still affects mathematical capacity indirectly through intelligence or, on the contrary, is not decisive. The results of various investigations indicate that males stand out in mathematics [
40,
41] and that females generally present a negative attitude towards this subject and their mathematical ability [
61,
62].
Considering the results of such investigations, no conclusion can be reached on gender-based differences or mathematic ability depending on intellectual capacity or the perception of competence and attitudes towards learning mathematics. Therefore, this article is intended to contribute to the study of possible differences in the learning of this subject and the study of STEM careers regarding gender and intellectual capacity. This objective is very relevant from an educational point of view, in order to promote gender-independent learning without limitations for the students.
In light of the above-mentioned results, two research questions are developed. First, to what extent does gender influence interest in mathematics? Second, to what extent does having or not having a high ability influence one’s interest in mathematics?
2. Materials and Methods
2.1. Methodology and Design
In order to respond to the objective of this research, to observe the differences in attitudes towards mathematic and STEM careers, considering, on the one hand, gender differences and, on the other hand, intelligence, an expo facto design was carried out, in which the covariations between two independent variables of the sample, high ability or normative intelligence group and male or female gender, were compared, the dependent variable being the score in the instrument called the Expectations and Values Questionnaire (EVQ). The independent variables are intelligence and gender, and the dependent variables are the Expectations and Values Questionnaire (EVQ) factors.
2.2. Sample
The sample comprised 1147 participants between the ages of 11 and 17 and between their first and third years of high school, selected by convenience sampling of schools belonging to the autonomous community of the Canary Islands. From this larger sample, an intentional selection was made to obtain a high-ability population and a complementary population without high abilities. After the high-ability sample was obtained, the students that formed this group were matched based on gender, age and year with members of the other group to obtain two groups, both as homogenous as possible. Finally, each group comprised 101 participants: 41 women, 58 men and 2 non-binary people.
Table 1 shows the intentionally selected participants as well as the means and standard deviations of the ages in both groups, divided by gender.
It should be emphasised that those who identified themselves as “other” were eliminated from the study, because the number of people in this category was not representative of the total sample.
In
Table 2, participants are shown by gender and course.
It should be emphasised that those who identified themselves in the category of “other” were eliminated from this study, since the amount of people in this category was not representative with respect of the total sample.
2.3. Research Instruments
To determine, in the first instance, the students’ intelligence and to form groups based on said intelligence, the Matrices-TAI questionnaire was used, which consists of 27 items from a set of 326 items, selected after the Bayesian EAP estimation was established. For first- and second-year students, level D of this instrument was used, whereas for third-year students, level E was used. The data collection process is ongoing, so the reliability values cannot be provided at this moment [
63].
To establish gender stereotypes related to mathematics and STEM career choices, the shortened version of the Expectations and Values Questionnaire (EVQ) was used. This questionnaire consists of 26 items and utilizes a Likert scale ranging from 1 to 7. Per the authors, α = 0.858 and the construct validity is 0.825 [
64].
Additionally, a qualitive analysis was conducted based on two open-ended questions included in said questionnaire. The question was, “Do you plan to pursue a STEM career? Why?”
2.4. Procedure
After the project’s approval by the Committee on Ethics in Research and Animal Welfare (CEIBA) of the University of La Laguna, which verified that this project complies with the ethical and data projection requirements of this type of research and whose registration number is CEIBA2021-0449, the sample was accessed. First, authorization was requested from the institutes involved for participation in this study. After this authorization was obtained, a document was provided so the students and their parents had proof of the realization of the tests and the data’s confidentiality. Also, families were provided with a document for authorization by the parents of those students under 14 years of age. Once they were obtained, the test pass with the instruments used was conducted in each centre’s facilities. Several scales were passed, among which were those used in this study. The tests were administered in person, and researchers as well as teachers of the centres were present at all times. Data were collected online with the support that the centres had available, mainly computers or tablets. Participants were not offered any incentive.
In addition, before the tests began, students were informed about data protection and that the information collected would be used only for academic purposes. Also, an individual code was provided for each student to maintain the data’s anonymity.
2.5. Data Analysis
A quantitative and qualitative analysis was conducted to observe the possible differences in the attitudes towards mathematic and STEM careers and to determine whether there is a difference based on gender and intelligence.
Considering the quantitative analysis, Cronbach’s alpha was first checked from the complete questionnaire and from the factors independently, and the items that required it were reverse scored. Second, differences based on intellectual capacity and gender were verified by conducting a MANOVA for the factors, in which the independent variables were gender and intelligence, and the dependent variables were each of the factors. These quantitative analyses were conducted with SPSS, version 25.
The qualitative analysis was conducted with ALCESTE, created by [
65] in the framework of the investigation of linguistic analysis methods. This software allows users to examine the structure of the vocabulary used as well as linguistic materials, such as open questions in questionnaires [
66]. After analysis, the software provides several classes, depending on the correlation between the verbal content provided. Therefore, the software’s author states that it is relevant to consider the context in which the answers are given to obtain a better understanding of the results and not only to perform a structural analysis of the content [
67,
68].
4. Discussion
This research was based on two fundamental questions: To what extent does gender influence interest in mathematics? Secondly, to what extent does having or not having high abilities influence interest in mathematics? Given the ample opportunities the mixed-method approach offers, the results show that, contrary to the expectation that the high-ability group would score higher than the normative group in their attitudes towards mathematic and STEM careers, the normative group scored higher. Furthermore, the analysis of the factors revealed that in two of the five factors, the normative group scored higher than the high-ability group, specifically in terms of their enjoyment of mathematics and their belief in the importance of mathematics for their future. On the other hand, for the remaining three factors, no significant differences were observed in favour of either group.
Nonetheless, these differences may be attributed to the possibility that the instrument uses items that may not be fully adapted to the high-ability group or may not accurately capture the construct, considering the context in which the students are placed. Because this study focuses on secondary education students, the content of mathematics taught in class may be geared towards the normative population, making it less interesting or engaging for the group with high abilities. This can be observed, for instance, in items such as number 3, which states, “I learn many interesting things in mathematics”. Students with high abilities might already be familiar with the curriculum being taught and may not feel that they are learning new content or may feel that they are not being challenged. For future research involving students with high abilities, it may be beneficial to use a different instrument that is better adapted to the specific context in which these students are placed. Such an assessment can better capture their attitudes towards and perceptions of mathematics and STEM fields, providing a more accurate understanding of their experiences and interests.
On the other hand, no gender differences were observed for any of the factors. Research on attitudes towards mathematics has shown varied results regarding gender differences. As in the current study, [
9,
33] found no gender differences in this subject among adolescents. However, [
35] observed that women perceived greater opportunities in math classes and showed a greater interest in mathematics than men. These findings, particularly regarding mathematics, are becoming increasingly uncommon.
Finally, a mixed analysis offers the possibility of providing an expanded view of the research results. This increases the relevance of the study, as it complements the quantitative results with the qualitative analysis and allows for a detailed explanation of what subjects report in detail in the open-ended answers of a questionnaire.
Regarding the qualitative analysis of the choice of STEM careers [
2,
3,
4], the high-ability group provided responses with more substantial content as well as longer and denser explanations and showed a stronger connection to the topic of STEM careers. They offered explanations for why they do or do not want to pursue STEM careers, and in the latter case, they outlined alternative career options they plan or wish to pursue in the future. On the other hand, in the normative group, more responses and explanations focused solely on whether they like or are interested in these types of careers without providing extensive explanations for why they do not like or are not interested in them. Also, the comparison of the classes obtained in the ALCESTE analysis makes it evident that the high-ability group’s classes are more closely related to the topic of STEM careers. Additionally, students in this group made connections between two STEM careers on two occasions, namely, between technological and engineering (as observed in class 1) and between mathematics- and science-related careers (as found in class 3).