Table 2

Rate of gain in skinfold thickness during pregnancy according to pre-pregnancy BMI categories

Skinfold site	Pre-pregnancy BMI	Early pregnancy Trimester 2–Trimester 1 (mm/week)			Late pregnancy Trimester 3–Trimester 2 (mm/week)
Skinfold site	Pre-pregnancy BMI	n	Mean±SD	P value	n	Mean±SD	P value
Triceps*	Underweight		NA	NS	51	0.06±0.30†‡	0.009
	Normal	234	0.12±0.42		988	0.08±0.37†
	Overweight	81	0.18±0.64		326	0.06±0.41† ‡
	Obese	53	0.10±0.84		164	−0.03±0.47‡
Subscapula*	Underweight		NA	0.001	51	0.17±0.24	NS
	Normal	217	0.18±0.36†		970	0.20±0.36
	Overweight	84	0.04±0.60†‡		328	0.18±0.45
	Obese	50	−0.09±0.59‡		158	0.16±0.47
Suprailiac*	Underweight		NA	<0.01	52	0.26±0.46† ‡	0.02
	Normal	233	0.33±0.65†		978	0.24±0.57†
	Overweight	79	0.04±0.88‡		323	0.14±0.58 ‡
	Obese	51	−0.24±0.88‡		160	0.11±0.60 ‡
Thigh*	Underweight		NA	NS	53	0.25±0.52† ‡	0.02
	Normal	228	0.15±0.64		967	0.27±0.55†
	Overweight	77	0.05±1.05		314	0.28±0.63†
	Obese	47	0.14±0.75		154	0.12±0.59 ‡

*One-way ANOVA and post hoc estimation by Tukey’s multiple comparisons test.
†‡Values with different symbols within a column are significantly different from each other, the p values for significance are presented in adjacent the columns.
ANOVA, analysis of variance; BMI, body mass index; NA, not applicable, due to small sample size (n=6); NS, statistically not significant.