Table 1.

Sociodemographic Characteristics of the Study Population.

	Percentage	Frequency
Age of infant at first visit (n = 85)
<7 days	10%	8
1-4 weeks	50%	43
5-8 weeks	28%	24
9-12 weeks	11%	9
>12 weeks	1%	1
Age of infants at follow-up (n = 72)
0-4 weeks	3%	2
5-8 weeks	14%	10
9-12 weeks	14%	10
13-16 weeks	22%	16
>16 weeks	47%	34
Mothers age, years (n = 84)
<18	1%	1
19-30	34%	28
31-40	63%	53
>40	2%	2
Ethnic origin (n = 85)
White British	85%	72
White (other)	11%	9
Indian, Pakistani	1%	1
Other Asian	1%	1
Black (other)	2%	2