Table 8 Unadjusted mean head circumference (HC) in millimeters (mm) among live newborns born between April and November 2015, and differences in mean HC by available variables
|  | n | Mean HC in mm | SD | Pr > |t| |
|---|---|---|---|---|
Sex of infant | ||||
 Female | 3235 | 353.90 | 22.17 | <0.001 |
 Male (ref) | 3477 | 356.30 | 22.76 |  |
Intervention | ||||
 Yes | 4583 | 356.20 | 23.88 | <0.001 |
 No (ref) | 2137 | 352.70 | 19.07 |  |
SP dosage | ||||
 0 | 2258 | 353.63 | 23.51 | <0.0001 |
 1 | 871 | 355.39 | 23.14 | 0.10 |
 2 | 1682 | 354.90 | 21.37 | 0.01 |
 3+ (ref) | 1909 | 356.93 | 21.89 |  |
Primigravida | ||||
 Yes | 1225 | 354.30 | 22.57 | 0.18 |
 No (ref) | 5486 | 355.30 | 22.51 |  |
At least 1 ANC visit | ||||
 Yes | 3805 | 356.00 | 20.19 | 0.00 |
 No (ref) | 2915 | 354.00 | 25.20 |  |
Month of birth | ||||
 April | 755 | 360.50 | 22.89 | <0.0001 |
 May | 887 | 355.49 | 20.92 | 0.54 |
 June | 838 | 353.06 | 20.86 | 0.11 |
 July | 766 | 354.53 | 23.78 | 0.79 |
 August | 809 | 354.31 | 22.61 | 0.64 |
 September | 860 | 352.98 | 26.17 | 0.09 |
 October | 959 | 355.63 | 20.88 | 0.45 |
 November (ref) | 846 | 354.83 | 21.14 |  |
Gestational age at delivery (months) | ||||
 8 | 18 | 342.50 | 26.44 | 0.00 |
 9 | 6588 | 355.06 | 22.57 | 0.01 |
 10 (ref) | 113 | 360.26 | 17.29 |  |