Association between nap time, nighttime sleep, and multimorbidity in Chinese older adults: a cross-sectional study

Table 3 Subgroup analysis of Age- and Gender-Specific factors affecting the impact of nighttime sleep duration on Multimorbidity among the elderly

Variables	Model one		Model two		Model three
Variables	OR (95%CI)	P for interaction	OR (95%CI)	P for interaction	OR (95%CI)	P for interaction
Nighttime sleep 6–8 h
Gender		0.470		0.655		0.629
Female	0.57 (0.48 ~ 0.67) **		0.67 (0.56 ~ 0.80) **		0.68 (0.57 ~ 0.81) **
Male	0.62 (0.52 ~ 0.74) **		0.70 (0.59 ~ 0.85) **		0.73 (0.61 ~ 0.88) **
Age		0.767		0.507		0.432
60–69	0.59 (0.51 ~ 0.68) **		0.70 (0.60 ~ 0.82) **		0.72 (0.62 ~ 0.85) **
70–79	0.58 (0.45 ~ 0.73) **		0.67 (0.52 ~ 0.86) **		0.70 (0.55 ~ 0.91) **
80 and above	0.49 (0.30 ~ 0.80) **		0.49 (0.29 ~ 0.82) **		0.46 (0.27 ~ 0.78) **

Note: **P < 0.01, *P < 0.05; OR: Odds Ratio, CI: Confidence Interval; Model 1 includes only basic demographic variables, Model 2 controls for demographic and lifestyle variables, and Model 3 includes all covariates including socioeconomic factors and lifestyle factors

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