Table 4 Cox model results for male household heads’ duration among all US trips

Age

1.002

0.979**

0.980**

0.977**

(0.007)

(0.010)

(0.010)

(0.010)

Age squared

1.000

1.000

1.000

1.000*

(0.0001)

(0.0001)

(0.0001)

(0.0001)

School

0.945***

0.946***

0.946***

0.949***

(0.011)

(0.011)

(0.011)

(0.011)

School squared

1.002*

1.002*

1.002*

1.002*

(0.001)

(0.001)

(0.001)

(0.001)

Consensual union

0.764***

0.764***

0.764***

0.768***

(0.037)

(0.037)

(0.037)

(0.037)

Never married

0.633***

0.638***

0.636***

0.670***

(0.080)

(0.082)

(0.082)

(0.086)

Once married but not now

0.675**

0.687**

0.683**

0.705**

(0.117)

(0.118)

(0.117)

(0.118)

Num. of children under 18

1.019**

(0.008)

Num. of adult children

0.975*

0.974*

0.978

(0.015)

(0.015)

(0.015)

Num. of daughters under 18

1.008

(0.012)

Num. of sons under 18

1.027**

(0.011)

Num. of children aged 0–4

1.069***

(0.013)

Num. of children aged 5–8

1.024**

(0.012)

Num. of children aged 9–12

1.031***

(0.012)

Num. of children aged 13–16

0.989

(0.013)

Num. of children aged 17–18

1.007

(0.021)

Num. of previous US trips

1.045***

1.045***

1.045***

1.045***

(0.003)

(0.004)

(0.004)

(0.004)

Green card/citizen

0.883***

0.890***

0.889***

0.894***

(0.035)

(0.035)

(0.035)

(0.036)

Visa

2.118***

2.135***

2.134***

2.125***

(0.092)

(0.092)

(0.092)

(0.091)

IRCA

0.913***

0.923***

0.922***

0.941**

(0.023)

(0.024)

(0.024)

(0.024)

Mex US dist

0.9998***

0.9998***

0.9998***

0.9998***

(0.00003)

(0.00003)

(0.00003)

(0.00003)

Log pseudolikelihood

–139,830.5

–139,815.33

–139,815.18

–139,784.66

Num. of obs

17,052

17,052

17,052

17,052