Table 2:

Results from discrete-time hazard models predicting the transition to first birth

Variable	M1	M2	M3	M4	M5	M6	M7
Wife’s age	−0.083 [−0.127, −0.040]	−0.074 [−0.116, −0.033]	−0.070 [−0.110, −0.029]	−0.072 [−0.113, −0.031]	−0.076 [−0.116, −0.035]	−0.075 [−0.116, −0.034]	−0.076 [−0.120, −0.031]
Husband’s age	−0.037 [−.077, 0.004]	−0.048 [−0.088, −0.009]	−0.060 [−0.098, −0.021]	−0.054 [−0.093, −0.015]	−0.051 [−0.089, −0.013]	−0.052 [−0.091, −0.013]	−0.052 [−0.095, −0.010]
Region
Seoul (omitted)
Metropolitan cities	0.178 [−.137, 0.493]	0.151 [−0.163, 0.464]	0.111 [−0.200, 0.422]	0.131 [−0.180, 0.442]	0.116 [−0.194, 0.426]	0.103 [−0.209, 0.416]	0.190 [−0.131, 0.511]
Other areas	0.020 [−.261, 0.301]	0.004 [−0.277, 0.285]	−0.034 [−0.314, 0.246]	−0.019 [−0.299, 0.261]	−0.018 [−0.297, 0.261]	−0.022 [−0.304, 0.260]	−0.008 [−0.295, 0.279]
Time since first marriage
0–1 year (omitted)
2–3 years	−0.318 [−0.568, −0.069]	−0.347 [−0.595, −0.098]	−0.355 [−0.604, −0.106]	−0.338 [−0.587, −0.089]	−0.353 [−0.602, −0.103]	−0.357 [−0.606, −0.108]	−0.333 [−0.589, −0.077]
4–5 years	−0.686 [−1.056, −0.317]	−0.728 [−1.094, −0.362]	−0.783 [−1.151, −0.415]	−0.744 [−1.111, −0.378]	−0.748 [−1.114, −0.382]	−0.743 [−1.109, −0.376]	−0.737 [−1.113, −0.361]
6+ years	−1.613 [−2.135, −1.092]	−1.713 [−2.231, −1.195]	−1.805 [−2.323, −1.286]	−1.791 [−2.311, −1.271]	−1.801 [−2.320, −1.281]	−1.816 [−2.341, −1.291]	−1.620 [−2.144, −1.096]
Wife’s educational attainment
Less than high school	−1.575 [−2.625, −0.525]						−1.562 [−2.656, −0.469]
High school (omitted)
Some college / junior college	0.326 [0.041, 0.612]						0.320 [−0.003, 0.642]
University or more	0.361 [0.097, 0.624]						0.343 [−0.011, 0.696]
Husband’s educational attainment
Less than high school		−0.643 [−1.438, 0.153]					−0.158 [−1.024, 0.709]
High school (omitted)
Some college / junior college		0.167 [−0.143, 0.476]					−0.014 [−0.359, 0.331]
University or more		0.329 [0.048, 0.609]					0.068 [−0.300, 0.437]
Wife’s employment status
Non-employment (omitted)
Standard employment			−0.435 [−0.674, −0.196]				−0.477 [−0.724, −0.230]
Nonstandard employment			−0.526 [−1.000, −0.052]				−0.562 [−1.048, −0.076]
Self-employment			−0.434 [−0.869, 0.001]				−0.451 [−0.908, 0.005]
Husband’s employment status
Non-employment (omitted)
Standard employment				0.899 [0.345, 1.453]			0.830 [0.263, 1.397]
Nonstandard employment				0.739 [−0.026, 1.504]			0.927 [0.124, 1.730]
Self-employment				0.917 [0.296, 1.539]			0.957 [0.317, 1.598]
Annual household income (logged)1					0.046 [−0.097, 0.189]		−0.036 [−0.194, 0.123]
Homeownership
Homeowner (omitted)
Jeonse (key money)						−0.187 [−0.438, 0.063]	−0.171 [−0.426, 0.084]
Weolse (monthly rent)						−0.556 [−0.974, −0.138]	−0.419 [−0.853, 0.015]
Other						−0.071 [−0.534, 0.393]	−0.107 [−0.581, 0.368]
Constant	2.998 [1.984, 4.011]	3.137 [2.136, 4.139]	3.852 [2.849, 4.854]	2.602 [1.500, 3.705]	3.322 [2.299, 4.346]	3.647 [2.617, 4.678]	2.989 [1.741, 4.237]
Person-year observations	2,297	2,297	2,297	2,297	2,297	2,297	2,297

¹Annual household income is measured in 1,000,000 KRW, approximately 830 USD.

95% confidence intervals in brackets.