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Table 4 Results of Cox proportional hazard model

From: Is the “seven-year itch” real?—a study on the changing divorce pattern in Chinese marriages

  Classic Cox Stratified Cox
Coefficient Standard error Coefficient Standard error
Marriage cohort (before 1980 = 0)     
 • 1980–1989 1.253*** 0.129   
 • 1990–1999 1.768*** 0.138
 • 2000–2010 2.318*** 0.168
City (countryside = 0) 0.569*** 0.092 0.556*** 0.092
Wife’s first marriage age −0.026* 0.011 −0.027* 0.011
Wife’s education level (Elementary School or below = 0)     
 • Secondary school 0.313* 0.129 0.313* 0.129
 • High school 0.348* 0.152 0.350* 0.152
 • College and above 0.368+ 0.210 0.375+ 0.210
 • Missing value 3.309*** 0.113 3.292*** 0.113
Number of children     
 • No. of children aged 0 −1.874*** 0.311 −1.820*** 0.312
 • No. of children aged 1–5 −0.830*** 0.102 −0.816*** 0.104
 • No. of children aged 6–12 −0.700*** 0.102 −0.725*** 0.105
 • No. of children older than 13 −0.472*** 0.110 −0.494*** 0.109
Having son (no = 0) −0.209* 0.098* −0.212* 0.098
Quasi-likelihood radio chi-square 1471.02*** 1249.40***
df 14 11
Sample size 16,472 16,472
Person-years 408,487 408,487
  1. Note: + p < 0.10, *p < 0.05, **p < 0.01, ***p < 0.001