Table 6.

Comparison of pain crisis episodes in the year before starting Hydroxyurea treatment and in the year after starting Hydroxyurea

Age group	Pain crisis episodes		Change (%)	Paired t test (p value)
	Before	After
Age 0–10 years	2.91	0.36	−88	9.03 (<0.0001)
Age 11–20 years	3.77	0.55	−84	10.72 (<0.0001)
Age 21–30 years	2.77	0.42	−84	13.41 (<0.0001)
Age 31 years and above	3.18	0.27	−91	9.22 (<0.0001)