APIM analysis
We screened 397 infertile couples among 1022 subjects for inclusion in
the APIM with distinguishable dyads. The results showed that both female
and male chronotype exerted an actor effect on their own depressive
symptoms (β = -0.514, p <0.001; β = -0.228,p <0.045, respectively). However, contrary to our
expectations, our study did not observe a strong partner effect of
female/male chronotype on spouse depressive symptoms. Specifically, the
earlier chronotype for husband had a detrimental effect on wife’s
depressive symptoms (β = 0.145, p = 0.200), yet the earlier
chronotype for the wife had a protective effect on husband’s depressive
symptoms (β = -0.074, p = 0.577), but neither was statistically
significant (Table 3 ).