Table 1.
Demographics within the two time periods of 14 years
| Variable | Period (Mean ± SD) | t-value | p-value | ||
|---|---|---|---|---|---|
| I (n = 129) | II (n = 105) | Total/95% CI | |||
| Age | 30.58 ± 5.12 | 29.68 ± 4.75 | – | 1.37 | 0.171 |
| Parity | 1.42 ± 1.32 | 1.46 ± 1.33 | – | −0.23 | 0.817 |
| GA at delivery | 37.16 ± 2.30 | 36.89 ± 2.78 | 0.79 | 0.428 | |
| Tribe | |||||
| Delta | 1 (1.2) | 1 (0.8) | 2 (1.0) | ||
| Igbo | 3 (3.4) | 0 (0.0) | 3 (1.4) | 4.30 | 0.116 |
| Yoruba | 83 (95.4) | 120 (99.2) | 203 (97.6) | ||
| Prevalence | |||||
| Actual | 21.7 ± 11.4 | – | 11.1–32.3 | 0.39 | 0.699 |
| – | 19.7 ± 7.5 | 12.8–26.6 | |||
| Retrieved | 16.0 ± 10.5 | – | 6.2 | −25.7 | 0.817 |
| – | 15.0 ± 4.8 | 10.5–19.4 | 0.23 | ||
| Birthweight | |||||
| Twin 1 | |||||
| ≤0.99 | 0 (0.0) | 2 (1.9) | 2 (0.9) | ||
| 1.0 to 1.49 | 2 (1.5) | 8 (7.6) | 10 (4.3) | 9.63 | 0.022 |
| 1.5 to 2.49 | 61 (47.3) | 37 (35.2) | 98 (41.9) | ||
| 2.5 to 3.9 | 66 (51.2) | 58 (55.2) | 124 (53.0) | ||
| Twin 2 | |||||
| ≤0.99 | 3 (1.3) | 0 (0.0) | 3 (2.8) | ||
| 1.0 to 1.49 | 13 (5.6) | 6 (4.6) | 7 (6.7) | 8.02 | 0.046 |
| 1.5 to 2.49 | 115 (49.2) | 72 (55.8) | 43 (40.9) | ||
| 2.5 to 3.9 | 103 (44.0) | 51 (39.5) | 52 (49.5) | ||
CI, confidence interval; GA, gestational age; SD, standard deviation.