Table 2. Distribution of total haemoglobin levels by gender in 13172 subjects with an AA haemoglobin genotype. Percentage expressed among those with complete haematology.

Haemoglobin level (g/dL)	Males (%)	Females (%)	Total
4.0 – 4.9	0	3 (0.04)	3
5.0 – 5.9	0	4 (0.05)	4
6.0 – 6.9	0	18 (0.24)	18
7.0 – 7.9	4 (0.07)	37 (0.50)	41
8.0 – 8.9	2 (0.03)	65 (0.88)	67
9.0 – 9.9	15 (0.26)	153 (2.07)	168
10.0 – 10.9	29 (0.50)	391 (5.29)	420
11.0 – 11.9	75 (1.30)	1369 (18.51)	1444
12.0 – 12.9	344 (5.96)	2745 (37.11)	3089
13.0 – 13.9	1215 (21.04)	2019 (27.30)	3234
14.0 – 14.9	2115 (36.62)	540 (7.30)	2655
15.0 – 15.9	1483 (25.68)	44 (0.59)	1527
16.0 – 16.9	439 (7.60)	6 (0.08)	445
17.0 – 17.9	48 (0.83)	1	49
18.0 –	7 (0.12)	1†	8
Total	5776	7396	13172

NB: Blood sample inadequate for haematology in 28 subjects (1 male, 27 female)

^†Subject subsequently found to have congenital heart disease