Table 9.

HbA₂ levels in school children with β-thalassemia trait

HbA2 (%)	Mumbai			Delhi
	No.	%	Cum%	No.	%	Cum%
3.5–4.0	6	4.0	4.0	106	35.8	35.8
4.1–4.5	26	17.1	21.1	72	24.3	60.1
4.6–5.0	30	19.7	40.8	41	13.9	74.0
5.1–5.5	42	27.6	68.4	26	8.8	82.8
5.6–6.0	28	18.4	86.8	25	8.4	91.2
6.1–6.5	16	10.5	97.3	13	4.4	95.6
6.6–7.0	3	2.0	99.3	7	2.4	98.0
7.1–7.5	1	0.7	100.0	6	2.0	100
Total	152			296