Table 3.

Risk of adequate response to individual serotypes according to age at assessment.

Serotype	Age group	Serotype response rate percentage (n)	RR for serotype response	P-value
1	Under 5 years	65·8 (25/38)	0·79 (0·60–1·04)	0·08
	5–16 years	83·3 (30/36)	1·0
3	Under 5 years	81·6 (31/38)	1·22 (0·93–1·61)	0·14
	5–16 years	66·7 (24/36)	1·0
4	Under 5 years	81·6 (31/38)	0·98 (0·79–1·21)	0·84
	5–16 years	83·3 (30/36)	1·0
5	Under 5 years	55·3 (21/38)	0·80 (0·56–1·14)	0·21
	5–16 years	69·4 (25/36)	1·0
6B	Under 5 years	18·4 (7/38)	0·44 (0·20–0·96)	0·03*
	5–16 years	41·7 (15/36)	1·0
7	Under 5 years	86·8 (33/38)	0·98 (0·82–1·16)	0·27
	5–16 years	88·9 (32/36)	1·0
9V	Under 5 years	68·4 (26/38)	0·95 (0·70–1·27)	0·13
	5–16 years	72·2 (26/36)	1·0
14	Under 5 years	55·3 (21/38)	0·62 (0·46–0·85)	< 0·01**
	5–16 years	88·9 (32/36)	1·0
15	Under 5 years	73·7 (28/38)	0·88 (0·70–1·24)	0·31
	5–16 years	83·3 (30/36)	1·0
18C	Under 5 years	89·5 (34/38)	1·11 (0·91–1·35)	0·28
	5–16 years	80·6 (29/36)	1·0
19F	Under 5 years	50·0 (19/38)	0·95 (0·61–1·48)	0·81
	5–16 years	52·8 (19/36)	1·0
23F	Under 5 years	42·1 (16/38)	0·76 (0·47–1·22)	0·25
	5–16 years	55·6 (20/36)	1·0

^*P < 0·05;

^**P < 0·01. χ² test, or where expected values are below 5, Fisher’s exact test was used.