TABLE 2.

Difference in mean IgG antibody concentration obtained from dried blood spots, comparing baseline (day 0 samples stored at central laboratory) with samples stored for 30 days at sites

Antibody and IDa	Day 0 meanb	Dibrugarh		Chennai		Jaipur		Ghatampur
		Mean differencec	P valued	Mean difference	P value	Mean difference	P value	Mean difference	P value
Measles
1	95.7	−3.8	0.59	−3.7	0.61	−10.8	0.14	−13.6	0.10
2	345.8	−2.0	0.87	−26.3	0.06	−24.5	0.04	−24.5	0.07
3	437.5	153.1	<0.001	2.9	0.80	−95.0	<0.001	−92.2	<0.001
4	3,986.9	182.8	0.31	40.3	0.80	−647.6	0.001	−641.5	0.001
5	1,917.0	−62.3	0.47	−123.9	0.12	−715.18	<0.001	−560.6	<0.001
6	3,445.9	−104.6	0.33	−150.8	0.12	−297.3	0.03	−229.6	0.05
Rubella
1	64.6	1.3	0.86	−16.0	0.02	−13.3	0.06	−19.2	0.01
2	5.3	−0.7	0.03	−0.9	0.001	−0.2	0.46	−0.0	0.92
3	46.7	16.4	<0.001	−4.6	0.02	−11.9	<0.001	−12	<0.001
4	161.0	4.2	0.27	5.0	0.23	−28.5	<0.001	−26.7	<0.001
5	19.8	5.0	<0.001	−2.2	0.05	−6.1	<0.001	−6.1	<0.001
6	169.1	−18.4	<0.001	−18.1	<0.001	−31.3	<0.001	−23.8	<0.001

^aID, identifier.

^bD0, day 0.

^cMean difference calculated as day 30 site value minus day 0 value calculated as the mean across the nine replicates for each individual.

^dP values obtained from one-way analysis of variance test. Boldface values show P < 0.002 (Bonferroni-corrected P value accounting for 24 pairwise comparisons).