Table 7.

Association between socioeconomic status and risk of sleep disturbances.

SES level	ORa (95% CI)	p
0–3 years of age
Low	3.07 (0.80–11.78)	0.04
Lower middle	2.67 (0.72–9.92)	0.14
Middle	1.05 (0.26–4.21)	0.93
Upper middle	2.61 (0.69–9.81)	0.15
High	2.13 (0.53–8.53)	0.28
4–12 years of age
Low	3.12 (0.86–11.28)	0.08
Lower middle	5.36 (1.84–15.62)	0.00
Middle	2.61 (0.91–7.47)	0.07
Upper middle	2.39 (0.84–6.79)	0.54
High	1.58 (0.53–4.75)	0.45
13–19 years of age
Low	1.26 (0.55–2.92)	0.57
Lower middle	2.32 (1.00–5.38)	0.56
Middle	1.20 (0.47–3.02)	0.69
Upper middle	1.87 (0.71–4.93)	0.20
High	3.81 (1.64–8.85)	0.00

Bold indicates statistical significance. CI, confidence interval; OR, odds ratio; SES, socioeconomic status.

^aObtained by bivariate logistic regression (Wald test; p ≤ 0.05).