. 2011 May 13;6(5):e19381. doi: 10.1371/journal.pone.0019381

Table 1. Participation rates and representativeness.

	n	n(%) / Mean(SD)		p
		Participants	Non-participants
MMR status at end of data collection^†
0 doses	1166	182 (15.6)	984 (84.4)	0.31
1 dose	882	135 (15.3)	747 (84.7)
2 doses	252	48 (19.0)	204 (81.0)
Child age (years) at end of data collection^‡	-	9.8 (3.6)	10.4 (3.8)	<0.01
IMD2007 score^‡	-	26.28 (15.64)	31.43 (17.14)	<0.001
Total	2300	365 (15.9)	1935 (84.1)	-

^†

: n(%), p values for Chi-square test;

^‡

: mean(SD), p values for independent samples t-test.