Table 5.

Concordance between BMI classifications during pregnancy by Atalah’s curve and the proposed new curve (for all women).

Curves	Beginning of prenatal period		Middle (19 - 23 weeks)		Last prenatal visit
Atalah’s / Proposed Curve	n	%	n	%	n	%
Concordant
Low Weight	26	4.2	37	5.6	30	4.5
Adequate Weight	252	40.6	267	40.3	233	35.2
Overweight	0	0.0	0	0.0	0	0.0
Obesity	22	3.5	29	4.4	57	8.6
TOTAL of concordant	300	48.3	333	50.2	320	48.3
Discordant
Adequate / Low Weight	3	0.5	9	1.4	50	7.6
Overweight / Adequate	172	27.7	171	25.8	177	26.7
Overweight / Obesity	71	11.4	67	10.1	45	6.8
Obesity / Overweight	75	12.1	83	12.5	70	10.6
Adequate / Overweight	0	0.0	0	0.0	0	0.0
Low Weight / Adequate	0	0.0	0	0.0	0	0.0
TOTAL of discordant	321	51.7	330	49.8	342	51.7
McNemar’s p-value	<0.0001		<0.0001		<0.0001
kappa (CI)	0.36 (0.32-0.41)		0.39 (0.35-0.44)		0.37 (0.33-0.42)

CI = confidence interval.