Table 4 shows main effects of SOB, gender and interaction effects of SOB×gender on each phenotype. SOB×gender interactions were prominent on total sensation seeking and the sensation seeking subscores, disinhibition and boredom susceptibility. As illustrated in Figure 1 for the SSS Total score, female winter-borns were on average less sensation seeking than female not-winter-borns, while male winter borns were more sensation seeking than male not-winter borns (the same pattern was evident across the three significant SSS sub-scales). In post-hoc analysis, the differences in total sensation seeking, disinhibition and boredom susceptibility by SOB were significant in males (SSS-Total: F[1,65] = 11.520, p = .001; SSS-D: F[1,69] = 9.469, p = .003; SSS-BS: F[1,72] = 8.257, p = .005) but not females (SSS-Total: F[1,94] = 1.257, p = .265; SSS-D: F[1,96] = 1.712, p = .194; SSS-BS: F[1,98] = 1.273, p = .262). There was also a trend towards an SOB×gender interaction effect on self-reported virginity status (Table 4). This effect of SOB was similarly prominent in males, but not females (not shown).
