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Table 3 Adjusted odds ratios (95% CI) for metabolic syndrome by sleep duration stratified by gender

From: Daily sleep duration and risk of metabolic syndrome among middle-aged and older Chinese adults: cross-sectional evidence from the Dongfeng–Tongji cohort study

  Model 1 Model 2 Model 3
Daily sleep duration (hours)
Male    
<7 1.21 (0.91-1.61) 1.28 (0.90-1.80)  
7-7.9 1.00 1.00  
8-8.9 0.99 (0.85-1.16) 1.14 (0.95-1.37)  
9-9.9 0.94 (0.80-1.09) 1.12 (0.93-1.34)  
≥10 1.08 (0.92-1.26) 1.10 (0.98-1.38)  
Female    
<7 1.13 (0.92-1.39) 1.06 (0.84-1.35)  
7-7.9 1.00 1.00  
8-8.9 1.16 (1.04-1.30) 1.20 (1.06-1.37)  
9-9.9 1.22 (1.08-1.36) 1.28 (1.12-1.46)  
≥10 1.29 (1.13-1.46) 1.33 (1.15-1.54)  
Nighttime sleep duration (hours)
Male    
<7 1.22 (1.01-1.46) 1.15 (0.93-1.44) 1.04 (0.93-1.17)
7-7.9 1.00 1.00 1.00
8-8.9 0.99 (0.89-1.11) 1.13 (0.99-1.29) 1.04 (0.97-1.12)
≥9 1.01 (0.89-1.14) 1.28 (1.10-1.49) 1.01 (0.94-1.10)
Female    
<7 0.96 (0.83-1.11) 0.94 (0.79-1.11) 0.93 (0.79-1.10)
7-7.9 1.00 1.00 1.00
8-8.9 1.08 (0.99-1.18) 1.06 (0.96-1.17) 1.05 (0.96-1.16)
≥9 1.04 (0.93-1.15) 1.10 (0.97-1.24) 1.10 (0.97-1.24)
Daytime napping duration (minutes)
Male    
None 1.00 1.00 1.00
<30 1.05 (0.79-1.40) 0.94 (0.67-1.33) 0.94 (0.67-1.33)
30-59 1.03 (0.89-1.19) 1.07 (0.90-1.28) 1.07 (0.90-1.28)
60-89 1.09 (0.97-1.23) 1.05 (0.91-1.22) 1.05 (0.91-1.22)
≥90 1.12 (1.00-1.28) 1.09 (0.94-1.27) 1.09 (0.94-1.27)
Female    
None 1.00 1.00 1.00
<30 0.92 (0.73-1.10) 0.87 (0.75-1.02) 0.88 (0.74-1.03)
30-59 1.02 (0.92-1.14) 1.03 (0.97-1.20) 1.03 (0.91-1.16)
60-89 1.10 (1.00-1.21) 1.08 (0.97-1.20) 1.08 (0.97-1.20)
≥90 1.22 (1.09-1.36) 1.21 (1.06-1.37) 1.20 (1.06-1.37)
  1. Model 1, adjusted for age, marriage, education, smoking status, drinking status, physical activity, coronary heart disease, myocardial infarction, stroke, and family history of hypertension or diabetes.
  2. Model 2, adjusted for the variables in model 1 plus body mass index (BMI).
  3. Model 3, adjusted for the variables in model 2 plus daytime napping duration or nighttime sleep duration, as appropriate.