Table 3. Cohort Characteristics.
| Canada
n=39,666 (Ontario test cohort) |
Philippines
n=82,909 |
China
n=4,448 |
|
|---|---|---|---|
| Sex, n (%) | |||
| Male | 19,536 (49.3%) | 42,867 (51.7%) | 2,351 (52.9 %) |
| Female | 20,130 (50.7%) | 40,042 (48.3%) | 2,097 (47.1 %) |
| Birth weight (g), mean±SD | |||
| Overall | 3,379 ± 530 | 3,001 ± 452 | 3,337 ± 437 |
| Term infants only | 3,431 ± 476 | 3,044 ± 414 | 3,369 ± 407 |
| Preterm infants only | 2,504 ± 623 | 2,250 ± 539 | 2,710 ± 536 |
| Low birth weight (<2500g), n (%) | 1812 (4.6%) | 8423 (10.2%) | 128 (2.9%) |
| SGA (<10 th Centile), n (%) | 1,561 (3.9%) | 11,295 (13.6%) | 123 (2.8%) |
| SGA (<3 rd Centile), n (%) | 363 (0.9%) | 3,407 (4.1%) | 19 (0.4 %) |
| LGA (>90 th Centile), n (%) | 8734 (22.0%) | 4780 (5.8%) | 741 (16.7%) |
| Completed gestational age
(wks), mean±SD |
39.3±1.6 | 38.5±1.4 | 38.9±1.4 |
| Term (≥37 wks), n (%) | 37,440 (94.4%) | 79,077 (95.4%) | 4,233 (95.2%) |
| Late Preterm (32–36 wks), n (%) | 2,049 (5.2%) | 3,566 (4.3%) | 197 (4.4 %) |
| Very Preterm (28–31 wks), n (%) | 126 (0.3%) | 233 (0.3%) | 11 (0.3 %) |
| Extremely Preterm (<28 wks), n (%) | 51 (0.1%) | 33 (0.0%) | 7 (0.2 %) |
SGA, small for gestational age (lowest 10 and 3 centiles within gestational age and sex strata, calculated in the Ontario cohort using Intergrowth-21 centiles and applied uniformly in the Ontario, China and Philippines cohorts)