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Absolute frequencies, outcome prevalences, exposure prevalences, crude and pooled prevalence ratio (PR) estimates, and relative confounding for the analysis of the modified data using mother in a paid job as the outcome, father living with the family as the risk factor and social class as confounder (situation 3 modified). |
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| First stratum: High social class |
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| Mother employed |
No |
All |
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| N |
Prev. |
N |
N |
Prev. exp. = 15.0% |
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|
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| Father Present |
73 |
90.1% |
8 |
81 |
PR = 1.80 |
| No |
230 |
50.0% |
230 |
460 |
M-H weight = 34.44 |
| All |
303 |
56.0% |
238 |
541 |
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| Second stratum: Low social class |
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|
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| Mother employed |
No |
All |
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|
|
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| N |
Prev. |
N |
N |
Prev. exp.= 80.0% |
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|
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| Father Present |
295 |
56.0% |
232 |
527 |
PR = 1.39 |
| No |
53 |
40.2% |
79 |
132 |
M-H weight = 42.38 |
| All |
348 |
52.8% |
311 |
659 |
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| Combined strata: High and low social class |
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| Mother employed |
No |
All |
Prev. exp.= 50.7% |
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|
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| N |
Prev. |
N |
N |
PR (crude) = 1.27 |
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| Father Present |
368 |
60.5% |
240 |
608 |
PR (M-H) = 1.58 |
| No |
283 |
47.8% |
309 |
592 |
Confounding = 24.6% |
| All |
651 |
54.3% |
549 |
1200 |
P-value(het) *= 0.01 |
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* P-value for testing heterogeneity of the prevalence ratios across strata. | |||||
Barros and Hirakata BMC Medical Research Methodology 2003 3:21 doi:10.1186/1471-2288-3-21 |
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