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. Author manuscript; available in PMC: 2024 Mar 27.
Published in final edited form as: Explor Res Hypothesis Med. 2023 Nov 29;9(1):15–24. doi: 10.14218/ERHM.2023.00039

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.