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Table 4 Standardized coefficients obtained from multiple logistic linear regression (MLLR)

From: The association between sleep duration, bedtimes, and early pubertal timing among Chinese adolescents: a cross-sectional study

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)

  1. The dependent variable was pubertal timing: on-time = 0; early pubertal timing = 1
  2. aBedtimes as a continuous variable
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Environmental Health and Preventive Medicine

ISSN: 1347-4715

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