Table 1

Incidence of idiopathic intracranial haemorrhage (ICH) in infants between day 8 and the end of week 12, in rural and urban Hanoi, 1995–1999

	1995	1996	1997	1998	1999	5 year totals
*Rural infants received no vitamin K prophylaxis in any year.
†Urban infants born at the Hanoi Obstetric and Gynaecological Hospital received vitamin K prophylaxis in 1998 and 1999 only.
‡Incidence per 100 000 births (95% confidence interval) based on five year totals.
Rural areas*
Total births	25290	24318	23652	22189	20301	115750
Number of cases of idiopathic ICH	38	32	33	39	22	164
Incidence of ICH per 100 000 births (no prophylaxis)	150	132	140	176	108	142 (122 to 165)‡
Urban areas
Total births	18502	19383	20058	21817	19871	99631
Number receiving no prophylaxis†	18502	19383	20058	14613	12189	84745
Number receiving prophylaxis†	Nil	Nil	Nil	7204	7682	14886
Number of cases of idiopathic ICH	15	22	16	7	9	69
Incidence of ICH per 100 000 births (no prophylaxis)	81	114	80	48	74	81 (65 to 101)‡
Incidence of ICH per 100 000 births (total births)	81	114	80	32	45	69 (55 to 88)‡
Combined rural and urban areas
Total births	43792	43701	43710	44006	40172	215381
Number receiving no prophylaxis	43792	43701	43710	36802	32490	200495
Number of cases of idiopathic ICH	53	54	49	46	31	233
Incidence of ICH per 100 000 births (no prophylaxis)	121	124	112	125	95	116 (102 to 132)‡
Incidence of ICH per 100 000 births (total births)	121	124	112	105	77	108 (95 to 123)‡