Table 1.
Maternal and birth characteristics according to Apgar score at 5 min among singleton term live births, British Columbia, 1993–2009
| Maternal and birth characteristics | Total | Apgar 0–3 (n=147) | Apgar 4–6 (n=1328) | Apgar 7 (n=2375) | Apgar 8 (n=7666) | Apgar 9 (n=101 191) | Apgar 10 (n=37 374) |
| No. (%) | % | % | % | % | % | % | |
| Total | 150 081 (100) | ||||||
| Maternal age (years) | |||||||
| ≤19 | 6170 (4.11) | 0.15 | 1.41 | 1.93 | 5.80 | 64.17 | 26.55 |
| 20–24 | 24 637 (16.42) | 0.09 | 1.11 | 1.77 | 5.88 | 64.83 | 26.32 |
| 25–29 | 43 832 (29.21) | 0.10 | 0.88 | 1.64 | 5.19 | 66.66 | 25.54 |
| 30–34 | 47 332 (31.54) | 0.10 | 0.80 | 1.50 | 4.76 | 68.45 | 24.39 |
| ≥35 | 28 081 (18.71) | 0.09 | 0.72 | 1.39 | 4.73 | 69.89 | 23.17 |
| Missing | 29 (0.02) | 0 | <17.24 | <17.24 | <17.24 | 58.62 | 31.03 |
| Socioeconomic status | |||||||
| Fifth quintile (highest) | 27 519 (18.34) | 0.10 | 0.90 | 1.64 | 5.00 | 66.88 | 25.47 |
| Fourth quintile | 31 282 (20.84) | 0.11 | 0.83 | 1.69 | 5.38 | 66.79 | 25.21 |
| Third quintile | 30 939 (20.61) | 0.10 | 0.86 | 1.65 | 5.18 | 67.47 | 24.74 |
| Second quintile | 31 266 (20.83) | 0.06 | 0.84 | 1.48 | 5.08 | 67.73 | 24.80 |
| First quintile (lowest) | 28 889 (19.25) | 0.12 | 1.00 | 1.45 | 4.88 | 68.25 | 24.30 |
| Missing | 186 (0.12) | 0 | <2.69 | <2.69 | 3.23 | 66.13 | 28.49 |
| Married | |||||||
| Yes | 103 099 (68.70) | 0.09 | 0.78 | 1.47 | 4.73 | 68.43 | 24.49 |
| No | 43 374 (28.90) | 0.12 | 1.13 | 1.85 | 6.01 | 64.93 | 25.95 |
| Missing | 3608 (2.40) | 0.17 | 0.89 | 1.47 | 4.93 | 68.63 | 23.92 |
| Infant’s sex | |||||||
| Female | 73 809 (49.18) | 0.08 | 0.78 | 1.46 | 4.91 | 67.17 | 25.61 |
| Male | 76 272 (50.82) | 0.12 | 0.99 | 1.70 | 5.30 | 67.67 | 24.22 |
| Birth order | |||||||
| 1 | 67 516 (44.99) | 0.12 | 1.25 | 2.09 | 6.13 | 67.92 | 22.49 |
| 2 | 56 025 (37.33) | 0.09 | 0.63 | 1.24 | 4.32 | 67.51 | 26.22 |
| 3 | 19 239 (12.82) | 0.07 | 0.46 | 1.05 | 4.13 | 66.66 | 27.63 |
| ≥4 | 7301 (4.86) | <0.07 | 0.56 | 0.99 | 4.34 | 64.17 | 29.91 |
| Gestational age (weeks) | |||||||
| 37 | 8966 (5.97) | 0.10 | 1.08 | 2.02 | 6.88 | 68.02 | 21.89 |
| 38 | 25 821 (17.20) | 0.05 | 0.74 | 1.37 | 4.67 | 68.21 | 24.96 |
| 39 | 37 408 (34.03) | 0.09 | 0.76 | 1.32 | 4.36 | 68.57 | 24.89 |
| 40 | 51 079 (34.03) | 0.10 | 0.82 | 1.65 | 5.05 | 66.31 | 26.08 |
| 41 | 25 040 (16.68) | 0.15 | 1.22 | 1.87 | 6.08 | 67.38 | 23.29 |
| 42–44 | 1767 (1.18) | <0.28 | 1.58 | 2.09 | 6.51 | 61.35 | 28.3 |
| Birth weight-for-gestational age | |||||||
| Appropriate | 121 035 (80.65) | 0.09 | 0.84 | 1.51 | 4.96 | 67.42 | 25.18 |
| Small | 11 581 (7.72) | 0.19 | 1.35 | 2.20 | 6.16 | 67.04 | 23.06 |
| Large | 17 445 (11.62) | 0.08 | 0.85 | 1.65 | 5.47 | 67.76 | 24.18 |
| Missing | 20 (0.01) | <25.00 | <25.00 | 0 | 0 | 40.00 | 50.00 |
| Child’s age at EDI data collection (years) | |||||||
| Mean (SD) | 5.70 (0.32) | 5.67 (0.30) | 5.65 (0.30) | 5.66 (0.30) | 5.66 (0.30) | 5.65 (0.30) | 5.65 (0.30) |
EDI, Early Development Instrument.