Table 2

Comparison of groups born in the Royal Maternity and Simpson's Memorial Hospital whose MHT scores were traced with those whose scores were not traced

 Variable MHT scores traced Mean (95% CI) n2-150 MHT scores not traced Mean (95% CI) n Difference in means (95% CI) p value2-152 Maternal age (y) 27.0 (26.4 to 27.6) 449 25.7 (25.2 to 26.2) 534 1.3 (0.5 to 2.0) 0.001 Parity 2.4 (2.2 to 2.6) 449 2.05 (1.9 to 2.2) 536 0.3 (0.09 to 0.6) 0.009 Gestation (wk) 39.4 (39.1 to 39.7) 339 39.6 (39.4 to 39.8) 432 0.2 (−0.5 to 0.2) 0.35 Days old 3984 (3974 to 3994) 449 3989 (3980 to 3998) 536 5 (−17.2 to 8.7) 0.52 Birth weight2-151 (g) 3317 (3267.5 to 3366.5) 449 3281 (3239.4 to 3322.6) 536 36 (−28.1 to 101.3) 0.26 Birth length (cm) 50.6 (50.3 to 50.9) 428 50.1 (49.9 to 50.3) 503 0.5 (0.14 to 0.86) 0.007 Placental weight (g) 658.8 (632.1 to 685.5) 124 641.6 (618.1 to 665.1) 113 17.2 (−28.5 to 43.1) 0.69 Umbilical cord length (cm) 56.7 (54.6 to 58.8) 121 54.0 (52.2 to 55.8) 109 2.7 (0 to 5.5) 0.06 Ponderal index (kg/m3) 25.6 (25.2 to 26.0) 428 26.1 (25.8 to 26.4) 503 0.5 (−0.002 to 1.0) 0.07
• 2-150 Total number of subjects for each variable is not always 449 because of missing data.

• 2-151 Original data converted to metric: 1 oz = 28 g, 1 inch = 2.5 cm, 1 lb = 453 g.

• 2-152 Calculated by paired t test on continuous variables.