. Author manuscript; available in PMC: 2021 Jun 1.

Published in final edited form as: Int J Gynaecol Obstet. 2020 Apr 8;149(3):359–369. doi: 10.1002/ijgo.13143

Table 2.

A comparison of preterm birth before 34 weeks of gestation to preterm birth at 34 weeks of gestation and thereafter.^a

Variables	Preterm birth < 34 weeks n = 216 (29.4%)	Preterm birth ≥ 34 weeks n = 518 (70.6%)	Test and P values
BMI (kg/m²)	24.4±5.4	24.5±5.6	ANOVA 0.798
Gravidity	2.3±1.5	2.3±1.4	ANOVA 0.890
Maternal education years	9.8±1.8	9.7±1.7	ANOVA 0.931
Running water at home	128±82.1	349±76.2	χ² 0.123
Use of methamphetamine	11±6.6	46±9.3	χ² 0.283
Maternal age (years)	24.9±6.4	24.8±5.9	ANOVA 0.807
Household income (Rands^b)	1016.26±670.08 115 (53.2)	784.41±596.15 320 (61.8)	ANOVA <0.001

Abbreviations: BMI, body mass index; SD, standard deviation.

Values are given as mean ± SD or number (percentage).

1 USD = 15.22 Rands.