Table 1.
Associations of self-report ethnicity and sex with time of scan, self-report variables, amygdala reactivity, season of study participation, and presence of psychiatric diagnosis
| Self-report ethnicity | Caucasian (s.d.) n=459 | African–American (s.d.) n=117 | Asian (s.d.) n=266 | Hispanic (s.d.) n=56 | Multi-racial (s.d.) n=103 | F/χ2 | P |
|---|---|---|---|---|---|---|---|
| Time of scan | 12.5617 (2.3198) | 12.8277 (2.1168) | 12.5436 (2.2036) | 13.0968 (2.424) | 12.4954 (2.4641) | 1.1488 | 0.3321 |
| Age | 19.795 (1.2488) | 19.6555 (1.182) | 19.6145 (1.3085) | 19.7258 (1.2825) | 19.6789 (1.1617) | 1.0232 | 0.3941 |
| PSQI | 4.8623 (2.3841) | 5.8083 (2.5487) | 4.7052 (2.499) | 4.9473 (2.8185) | 4.9308 (2.5963) | 4.3694 | 0.0017 |
| State STAI | 28.9878 (6.8017) | 30.425 (8.3738) | 29.2284 (6.574) | 29.6744 (6.221) | 29.3373 (6.9234) | 0.7335 | 0.5693 |
| n=327 | n=80 | n=197 | n=43 | n=83 | |||
| Bilateral AMY reactivity | 0.2491 (0.1884) | 0.1956 (0.1583) | 0.2023 (0.198) | 0.2451 (0.2094) | 0.2313 (0.1614) | 3.8757 | 0.0039 |
| Cosine-season | −0.0775 (0.5958) | −0.1592 (0.5618) | −0.0483 (0.5952) | −0.0083 (0.6086) | −0.005 (0.6236) | 1.2643 | 0.2822 |
| Sine-season | −0.1462 (0.7872) | −0.1005 (0.8106) | −0.2147 (0.7751) | 0.1579 (0.7878) | −0.1385 (0.7753) | 0.5615 | 0.6906 |
| Psychiatric diagnosis* | n=110 (23.4%) | n=28 (23.9%) | n=37 (13.9%) | n=17 (30.4%) | n=24 (23.3%) | 12.7487 | 0.0126 |
| Gender (# women)* | n=251 (54.7%) | n=85 (72.6%) | n=155 (58.3%) | n=37 (66.1%) | n=68 (66.0%) | 15.559 | 0.0037 |
| Sex | Men (s.d.) n=447 | Women (s.d.) n=596 | t/χ2 | P | |||
| Time of scan | 12.6454 (2.173) | 12.5872 (2.3755) | 0.411 | 0.6812 | |||
| Age | 19.745 (1.2993) | 19.693 (1.2139) | 0.658 | 0.5107 | |||
| PSQI | 4.7979 (2.3984) | 5.0484 (2.5693) | −1.6189 | 0.1058 | |||
| State STAI | 28.9811 (6.9427) | 29.5291 (6.88) | −1.0616 | 0.2888 | |||
| n=318 | n=412 | ||||||
| Cosine-season | −0.084 (0.6051) | −0.055 (0.5892) | −0.7746 | 0.4388 | |||
| Sine-season | −0.1495 (0.7789) | −0.166 (0.7899) | 0.3361 | 0.7369 | |||
| Bilateral AMY reactivity | 0.2604 (0.2117) | 0.2047 (0.1633) | 4.6288 | 4.3x10−6 | |||
| Psychiatric diagnosis* | n=108 (24.2%) | n=108 (18.1%) | 5.3134 | 0.0212 | |||
PSQI, Pittsburgh Sleep Quality Inventory; STAI, State-Trait Anxiety Inventory; AMY, Amygdala.
*
Analyses were run as a chi-squared test. All others were run as t-test.