Binary logistic regression models
We assessed the association of chronotype with the risk of depressive
status during infertility treatment, as shown inTable 2 . Compared to
subjects in the evening chronotype group, neutral chronotype (OR = 0.45,
95% CI: 0.28-0.72, P trend <0.001) and morning chronotype (OR
= 0.29, 95% CI: 0.18-0.49, P trend <0.001) were significantly
associated with lower odds of depressive symptoms. Similarly, after
adjusting for confounders, neutral chronotype (OR = 0.47, 95% CI:
0.28-0.77, P trend <0.001) and morning chronotype (OR = 0.32,
95% CI: 0.18-0.57, P trend <0.001) types were still
associated with lower odds of depressive status, although this risk
reduction was attenuated. For each standard deviation increase in MEQ-5
scores, the adjusted ORs (95% CIs) were 0.69 (0.59-0.79, P
<0.001) for depressive symptoms.