Table 4.

Standardized coefficients obtained from multiple logistic linear regression (MLLR)

Independent variable(s)	MLLR (N = 5461)
	β	SE	P	OR (95% CI)
Sleep duration
Insufficient	Ref
Sufficient	− 0.214	0.100	0.032	0.808 (0.664–0.982)
Bedtimes (pm)a	0.195	0.049	< 0.001	1.215 (1.104–1.338)
Sex
Male	Ref
Female	− 0.014	0.066	0.828	0.986 (0.867–1.121)
Only child
Yes	Ref
No	− 0.224	0.081	< 0.001	0.800 (0.682–0.937)
Father’s education level
Low	Ref
Medium	− 0.092	0.083	0.267	0.912 (0.775–1.073)
High	0.145	0.194	0.452	1.157 (0.791–1.690)
Mother’s education level
Low	Ref
Medium	− 0.028	0.083	0.735	0.972 (0.826–1.144)
High	− 0.009	0.209	0.996	0.991 (0.658–1.492)
Economic status
Poor	Ref
Medium	0.005	0.100	0.958	1.005 (0.826–1.224)
Good	− 0.080	0.109	0.462	0.923 (0.745–1.143)
Parents’ relationship
Poor	Ref
Neutral	0.273	0.204	0.180	1.314 (0.881–1.959)
Harmonious	0.185	0.190	0.332	1.203 (0.828–1.747)
Parenting style
Democratic	Ref
Autocratic	0.035	0.087	0.689	1.035 (0.873–1.228)
Doting	− 0.052	0.110	0.636	0.949 (0.765–1.178)
Disregardful	0.143	0.152	0.007	1.512 (1.122–2.036)
Age	− 0.096	0.023	< 0.001	0.909 (0.869–0.951)
BMI	0.056	0.010	< 0.001	1.057 (1.037–1.078)

The dependent variable was pubertal timing: on-time = 0; early pubertal timing = 1

^aBedtimes as a continuous variable