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The Cost of Ill Health WP 10/04

Appendix G

Appendix Table G1 – Mean and standard deviations of variables – logistic regression models,
all working age non-students, 2004/05
  Mean Standard deviation
Labour force participation (participation=1, not participating=0) 0.871 0.335
Gender (male=0, female=1) 0.515 0.500
Region (base=Auckland)    
Waikato (=1) 0.095 0.294
Wellington (=1) 0.127 0.333
Rest of North Island (=1) 0.231 0.422
Canterbury (=1) 0.153 0.360
Rest of South Island (=1) 0.110 0.313
Born in NZ (yes=1, no=0) 0.201 0.401
Ethnicity (base=NZ/European)    
Māori (=1) 0.110 0.313
Pacific Islander (=1) 0.048 0.214
Other (=1) 0.072 0.259
Age at interview date 41.337 12.530
Age 50 and over (15-49=0, 50 and over=1) 0.297 0.457
Highest qualification (base=school qualification)    
Post-school vocational qualification (=1) 0.383 0.486
Degree or higher (=1) 0.179 0.384
No qualification (=1) 0.179 0.384
Self-rated health (base=excellent)    
Very good 0.353 0.478
Good 0.199 0.399
Fair 0.054 0.226
Poor 0.014 0.117
Studying (no studying in reference period=0, studying in reference period=1) 0.126 0.332
Log other household income 8.383 4.110
Partner (base=working partner)    
Non-working partner (=1) 0.106 0.308
No partner (=1)    
Children (base=no children)    
Child(ren) minimum age 0-<5 0.160 0.367
Child(ren) minimum age 5-17 0.266 0.442
Years paid employment 21.496 12.490
Unemployment rate 3.707 0.296
Number of observations 10,120

Source: SoFIE Wave 3 Version 4, unweighted, Statistics New Zealand

Note: Based on original sample members who respond in Waves 1-3; who consent for their data to be linked to NZHIS information; and who are aged over 15 at the end of the reference period in Wave 1. Full-time students and those 65 years of age and over are excluded.

Appendix Table G2 – Estimated coefficients for participating – logistic regression model – 2004/05
  Coefficient Standard error P value 95% confidence intervals
        Lower Upper
Self-rated health (base=excellent)          
Very good -0.015 0.108 0.890 -0.227 0.197
Good -0.586*** 0.113 0.000 -0.808 -0.364
Fair -1.353*** 0.146 0.000 -1.639 -1.066
Poor -2.138*** 0.218 0.000 -2.565 -1.712
Sex (base=male)          
Female 0.032 0.187 0.863 -0.334 0.398
Region (base=Auckland)          
Waikato 0.306 0.160 0.056 -0.007 0.619
Wellington -0.129 0.136 0.343 -0.395 0.137
Rest of North Island 0.065 0.126 0.609 -0.183 0.312
Canterbury 0.182 0.136 0.183 -0.085 0.449
Rest of South Island 0.073 0.147 0.621 -0.216 0.361
Born in New Zealand (base=yes)          
No -0.048 0.127 0.706 -0.297 0.201
Ethnicity (base=NZ/European)          
Māori -0.187 0.129 0.146 -0.440 0.065
Pacific Islander -0.095 0.208 0.647 -0.503 0.313
Other -0.158 0.197 0.422 -0.545 0.228
Age at interview date -0.141*** 0.010 0.000 -0.160 -0.121

Aged 50 and over (base=15-49)

7.260*** 1.152 0.000 5.002 9.518
Highest qualification base=school qualification)          
Post-school vocational qualification 0.215** 0.105 0.041 0.009 0.421
Degree or higher 0.925*** 0.154 0.000 0.622 1.227
No qualification -0.499*** 0.113 0.000 -0.721 -0.277
Studying (base=no studying) -0.013 0.138 0.924 -0.284 0.257
Log other household income -0.006 0.011 0.580 -0.028 0.015
Partner (base=working partner)          
Non-working partner -0.949*** 0.198 0.000 -1.337 -0.561
No partner -0.870*** 0.188 0.000 -1.238 -0.501
Children (base=no children)          
Child(ren) minimum age 0-<5 0.541* 0.313 0.084 -0.072 1.155
Child(ren) minimum age 5-17 -0.190 0.208 0.361 -0.597 0.217
Years paid employment 0.218*** 0.016 0.000 0.187 0.250
Years paid employment squared -0.001*** 0.000 0.000 -0.002 -0.001
Unemployment rate -0.111 0.136 0.416 -0.378 0.156
Interactions          
Female*Child(ren) minimum age 0-<5 -2.850*** 0.329 0.000 -3.494 -2.205
Female*Child(ren) minimum age 5-17 -0.501** 0.238 0.035 -0.966 -0.035
Female*Non-working partner -0.485* 0.289 0.094 -1.052 0.082
Female*No partner 0.142 0.208 0.495 -0.265 0.549
Aged 50 and over*Age -0.138*** 0.022 0.000 -0.181 -0.096
Constant 5.968 0.630 0.000 4.734 7.203
Model summary statistics  
Number of observations 10,120
Chi-squared 2,936.01
Log-likelihood -2,619.53
Pseudo R2 0.3591

Source: SoFIE Wave 3 Version 4, adjusted longitudinal weight, Statistics New Zealand

Notes:
1. Based on original sample members who respond in Waves 1-3; who consent for their data to be linked to NZHIS information; and who are aged over 15 at the end of the reference period in Wave 1. Full-time students and those 65 years of age and over are excluded. All variables were included in the model and significant and insignificant variables or variable categories are kept in for completeness.
2. *Significant at the 90% level. **Significant at the 95% level. ***Significant at the 99% level.
3. The likelihood of participating was modelled. Not participating is the base category.

Appendix Table G3 – Estimated marginal effects – logistic regression model – 2004/05
  Marginal effect Standard error P value 95% confidence intervals
        Lower Upper
Self-rated health (base=excellent)          
Very good -0.001 0.006 0.890 -0.013 0.011
Good -0.039*** 0.009 0.000 -0.057 -0.022
Fair -0.132*** 0.022 0.000 -0.174 -0.090
Poor -0.289*** 0.048 0.000 -0.384 -0.194

Source: SoFIE Wave 3 Version 4, adjusted longitudinal weight, Statistics New Zealand

Notes:
1. Based on results in Appendix Tables G1 and G2. Other variables are fixed at their mean value.
2. *Significant at the 90% level. **Significant at the 95% level. ***Significant at the 99% level.

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