Table 1.

Baseline characteristics of freshmen.

	Frequency (N)	Percentage (%)
Gender
Female	9461	43.6
Male	12251	56.4
Age (years)
15–19	8314	38.6
20–29	11454	53.2
30–39	1253	5.8
40–49	454	2.1
>50	60	0.3
Hb (g/dL)
Low	3079	14.2
Normal	18270	84.5
High	273	1.3

Hb: haemoglobin concentration; haemoglobin thresholds used were 11.5–16.5 g/dL (females) and 12.5–17.0 g/dL (males).