the math portion of the SAT. At least one study has challenged the existence of the gender gap in mathematics. In 2008 Janet Hyde and others published a study showing that male and female students did equally well on No Child Left Behind standardized tests that were administered in second through eleventh grades in ten states. However, Hyde and her team did find gaps that favored males at the upper end of the achievement distribution and tried to examine gaps on more difficult test questions (previous research has shown that males outperform females on more challenging items), but the tests they examined lacked adequately challenging items. This raised questions about whether there is still a gender gap in math achievement. There is also a large discrepancy between the number of men and women working in STEM fields. Women have been, and continue to be, underrepresented in these fields. This underrepresentation is evident in the distribution of college majors among men and women; from 1997 to 2007, women earned only 18% of engineering bachelor's degrees. Degree attainment (Issued August 2003) Educational attainment by race and gender: 2000 Census 2000 Brief Percent of Adults 25 and over in group Men . . . . . . . . . . . . . 80.1 52.5 26.1 10.0 Women. . . . . . . . . . . . . . . . . . 80.7 51.1 22.8 7.8 HS = high school completed SC = some college BA = bachelor's degree AD = advanced degree According to 2007 data, 55 percent of college students were females and 45 percent were males. From 1995 until 2005, the number of males enrolled in college increased by 18 percent, while the number of female students rose by 27 percent. Males are enrolling in college in greater numbers than ever before, yet fewer than two-thirds of them are graduating with a bachelor's degree. The numbers of both men and women receiving a bachelor's degree have increased significantly, but the increasing rate of female college graduates exceeds the increasing rate for males. In 2014, the percentage of women with bachelor's degrees was higher than the percentage of men with bachelor's degrees for the first time in America. Women also earn more master's degrees and doctorates than men. Lifetime earnings Although more women are graduating with undergraduate degrees, men are still earning disproportionately more in their lifetimes.