Table 7.
Multiple logistic regression analysis, analysis of conditional maximum likelihood estimates, step 0
| Analysis of conditional maximum likelihood estimates | ||||||||
|---|---|---|---|---|---|---|---|---|
| Parameter | DF | Estimate | Standard error | Wald chi-Square | p value | aORa | 95% Wald confidence limits | |
| Rotavirus life vaccine dose 1 | 1 | 0.7358 | 0.3678 | 4.0022 | 0.0454 | 4.356 | 1.030 | 18.419 |
| Hexavalent vaccine dose 1 | 1 | 0.0539 | 0.2850 | 0.0357 | 0.8501 | 1.114 | 0.364 | 3.403 |
| Pneumococcal conjugate vaccine dose 1 | 1 | 0.2565 | 0.2716 | 0.8922 | 0.3449 | 1.670 | 0.576 | 4.843 |
| Meningococcal C vaccine dose 1 | 1 | 0.7592 | 0.4086 | 3.4517 | 0.0632 | 4.565 | 0.920 | 22.648 |
| Breastfeeding at the month of index date* | 1 | −0.3703 | 0.1609 | 5.2958 | 0.0214 | 0.477 | 0.254 | 0.896 |
| Formula milk at the month of index date* | 1 | −0.0878 | 0.1621 | 0.2938 | 0.5878 | 0.839 | 0.444 | 1.583 |
| Supplementary food at the month of index date* | 1 | 0.1107 | 0.2128 | 0.2705 | 0.6030 | 1.248 | 0.542 | 2.873 |
| Low birth weight (<2500g) | 1 | −0.9158 | 0.5540 | 2.7328 | 0.0983 | 0.160 | 0.018 | 1.405 |
| Family history of intussusception | 1 | 0.5612 | 0.2788 | 4.0500 | 0.0442 | 3.072 | 1.030 | 9.164 |
DF degrees of freedom; aOR adjusted odds ratio; * index date cases: date of symptom onset, controls: day of life on which the matching case experienced first symptoms of intussusception; amatched by gender, date of birth (± 30 calendar days), federal state, and place of residence (first digit of the zip code).