Table 1.

HBsAg, anti-HBc, anti-HBs positive rates and GMCs of on-time birth-dose participants for birth years 1987–1993

Birth year	Year after vaccination	Sample size	HBsAg			Anti-HBc			No. of positive	Anti-HBs
			No. of positive	Positive rate*	95% CI	No. of positive	Positive rate†	95% CI		Positive rate‡	95% CI	GMCs§	95% CI
1987	28	235	11	4·68	2·63–8·19	54	22·98	18·06–28·77	45	19·15	14·63–24·66	43·7	31·42–55·97
1988	27	243	12	4·94	2·71–8·04	56	23·05	18·19–28·73	51	20·99	16·34–26·54	47·7	36·05–59·35
1989	26	240	10	4·17	2·28–7·50	51	21·25	16·55–26·86	50	20·83	16·17–26·41	52·59	40·60–64·58
1990	25	253	7	2·77	1·35–5·60	55	21·74	17·10–27·22	60	23·72	18·89–29·33	58·08	46·60–69·57
1991	24	242	6	2·48	1·14–5·30	46	19·01	14·56–24·42	70	28·93	23·58–34·93	55·71	45·33–66·09
1992	23	168	4	2·38	0·93–5·96	25	14·88	10·29–21·04	55	32·74	26·10–40·15	61·57	50·09–70·04
1993	22	146	3	2·05	0·70–5·87	22	15·07	10·17–21·76	50	34·25	27·04–42·26	64·22	50·41–78·04
Total	−	1527	53	3·47	2·66–4·51	309	20·24	18·30–22·32	381	24·95	22·85–27·18	55·13	50·74–59·53

GMC, Geometric mean concentration; CI, confidence interval.

* χ²_trend = 4·80, P < 0·05, †χ²_trend = 7·10, P < 0·001, ‡ χ²_trend = 19·85, P < 0·001, § χ²_trend = 7·74, P < 0·001.