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Table 3 Ordered logistic regression models associating BMI-z quartile (dependent variable) and average 24-h sleep duration (Model 1) and nocturnal time-in-bed (Model 2)

From: Sleep and BMI in South African urban and rural, high and low-income preschool children

Model 1 Model 2
  OR 95% CI p-value   OR 95% CI p-value
Ave 24-h sleep duration 0.42 0.23, 0.78 0.006 Ave nocturnal time-in-bed 0.45 0.26, 0.79 0.005
Covariates Sex: Boy v girl 0.61 0.36, 1.03 0.066 Covariates Sex: Boy v girl 0.57 0.33, 0.97 0.037
Age 0.78 0.51, 1.20 0.261 Age 0.72 0.46, 1.13 0.153
Group: UL v UH 2.91 1.15, 7.40 0.025 Group: UL v UH 2.48 0.96, 6.38 0.060
RL v UH 1.14 0.48, 2.69 0.773 RL v UH 1.15 0.49 2.73 0.747
Sedentary Behaviour 0.99 0.98, 1.00 0.009 Sedentary Behaviour 0.99 0.98, 1.00 0.018
LMVPA 0.99 0.98, 1.00 0.128 LMVPA 1.00 0.99, 1.00 0.254
Model: n = 198, LR chi2 = 31.14, p < 0.001 Model: n = 198, LR chi2=31.62, p < 0.001
  1. OR Odds ratio, CI Confidence interval, UL Urban low-income group, UH Urban high-income group, RL Rural low-income group, LMVPA Low- to vigorous-intensity physical activity