Table 2.

Number of allele, gene frequency and incidence of each thalassemia gene observed among 350 newborns.

Thalassemia genes	Number of allele	Gene frequency	95% CI	Incidence of thalassemia
				This study	Lower Northern Thailand (16)	Northern Thailand (17)	Central Thailand (18)
SEA deletion	11	0.0157	0.008–0.028	3.1	5.2	6.7	4.6
3.7 deletion	88	0.1257	0.102–0.152	25.1	19.4*	18.6	17.2*
-α4.2 deletion	3	0.0043	0.001–0.012	0.8		0.8
Hb Constant Spring	19	0.0271	0.016–0.042	5.4	5.2	4.4	5.6
Hb Paksé	5	0.0071	0.002–0.017	1.4	0.5	0	0.5
Hb E	137	0.1957	0.167–0.227	39.1	22.9	11.5	22.7
β-thalassemia	2	0.0028	0.0003–0.0102	0.6	0.5	0.8	0.7

^*Combined α⁺ -thalassemia (-α^3.7 and -α^4.2)