Table 4 Mean coverage of the 95% confidence interval by the true value over the three sample sizes for outcome Birthweight
Death 4 covar. | Death 2 covar. | O2 dep. 4 covar | O2 dep 2 covar | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Perc. | Random inter. var | Random inter. var | Random inter. var | Random inter. var | ||||||||
Twins | 0.5 | 1 | 2 | 0.5 | 1 | 2 | 0.5 | 1 | 2 | 0.5 | 1 | 2 |
Logistic regression | ||||||||||||
2% | 0.99 | 1.00 | 1.00 | 0.93 | 0.92 | 0.91 | 1.00 | 1.00 | 1.00 | 0.99 | 0.99 | 0.99 |
5% | 0.99 | 1.00 | 1.00 | 0.95 | 0.94 | 0.94 | 1.00 | 1.00 | 1.00 | 0.99 | 0.99 | 0.99 |
10% | 0.99 | 1.00 | 1.00 | 0.98 | 0.98 | 0.98 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
20% | 0.99 | 1.00 | 1.00 | 0.99 | 0.98 | 0.98 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
Mixed logistic regression, PQL | ||||||||||||
2% | 0.67 | 0.66 | 0.68 | 0.79 | 0.79 | 0.82 | 0.69 | 0.71 | 0.76 | 0.95 | 0.96 | 0.97 |
5% | 0.59 | 0.58 | 0.58 | 0.91 | 0.91 | 0.92 | 0.76 | 0.79 | 0.85 | 1.00 | 1.00 | 0.99 |
10% | 0.57 | 0.56 | 0.58 | 0.96 | 0.96 | 0.97 | 0.87 | 0.89 | 0.93 | 1.00 | 1.00 | 1.00 |
20% | 0.56 | 0.55 | 0.60 | 0.99 | 0.99 | 0.99 | 0.95 | 0.96 | 0.97 | 1.00 | 1.00 | 1.00 |
Mixed logistic regression, Gauss-Hermite | ||||||||||||
2% | 0.99 | 1.00 | 1.00 | 0.94 | 0.96 | 0.97 | 1.00 | 1.00 | 1.00 | 0.99 | 1.00 | 1.00 |
5% | 0.98 | 0.99 | 0.99 | 0.94 | 0.96 | 0.98 | 1.00 | 1.00 | 1.00 | 0.99 | 1.00 | 1.00 |
10% | 0.98 | 0.98 | 0.99 | 0.94 | 0.97 | 0.99 | 1.00 | 1.00 | 1.00 | 0.99 | 1.00 | 1.00 |
20% | 0.97 | 0.97 | 0.98 | 0.95 | 0.98 | 0.99 | 1.00 | 1.00 | 1.00 | 0.99 | 1.00 | 1.00 |
GEE | ||||||||||||
2% | 0.98 | 0.98 | 0.98 | 0.50 | 0.56 | 0.60 | 0.99 | 0.99 | 0.99 | 0.59 | 0.67 | 0.77 |
5% | 0.98 | 0.98 | 0.98 | 0.54 | 0.63 | 0.68 | 1.00 | 1.00 | 1.00 | 0.66 | 0.76 | 0.86 |
10% | 0.98 | 0.98 | 0.98 | 0.58 | 0.71 | 0.84 | 1.00 | 1.00 | 1.00 | 0.71 | 0.83 | 0.93 |
20% | 0.98 | 0.98 | 0.98 | 0.65 | 0.80 | 0.92 | 1.00 | 1.00 | 1.00 | 0.78 | 0.90 | 0.97 |