Table 1.
Geographic and sociodemographic characteristics of the study population
| Study Cohort | |||
|---|---|---|---|
| False Positive, n (%) | Primary Comparison, n (%) | Matched Comparison, n (%) | |
| (n = 43) | (n = 545 355) | (n = 420) | |
| Sexa,* | |||
| Male | 28 (65.1) | 279 638 (51.3) | - |
| Female | 15 (34.9) | 265 717 (48.7) | - |
| Month of Birth | |||
| January – April | 19 (44.2) | 177 918 (32.6) | 142 (33.8) |
| May – August | 8 (18.6) | 192 896 (35.4) | 134 (31.9) |
| Sept – December | 16 (37.2) | 174 541 (32.0) | 144 (34.3) |
| Birth weight** | |||
| < 2500 g | 6 (14.0) | 33 027 (6.1) | 28 (6.7) |
| ≥ 2500 g | 37 (86.0) | 508 466 (93.2) | 390 (92.9) |
| Gestational age*** | |||
| < 37 weeks | 11 (25.6) | 42 235 (7.7) | 34 (8.1) |
| ≥ 37 weeks | 32 (74.4) | 489 232 (89.7) | 373 (88.8) |
| Relative incomea | |||
| ‘Lower’ | 21 (48.8) | 232 269 (42.6) | - |
| ‘Higher’ | 21 (48.8) | 310 003 (56.8) | - |
| Urban–rural statusa,b | |||
| Rural | < 6 (≤ 11.6) | 34 111 (6.3) | - |
| Urban | 38–43 (≥ 88.4) | 505 236 (92.6) | - |
* P < 0.10 for difference in proportion in the false positive cohort versus the comparison cohort
** P < 0.05 for difference in proportion in the false positive cohort versus the comparison cohort
*** P < 0.01 for difference in proportion in the false positive cohort versus the comparison cohort
aCounts are not presented for secondary matched comparison group on matched variables
bResults are repressed for cell sizes < 6