Evaluation of growth hormone provocative tests in Egyptian children with growth hormone-related short stature

Table 2 Comparing the percentage of cases with optimal growth hormone response (≥ 10 ng/mL) in different provocative tests in each test sample, n (%)

Sampling time	Insulin tolerance test (n = 50)	Clonidine test (n = 50)	L-DOPA test (n = 50)	P value
Basal sample	2 (4)	1 (2)	1 (2)	0.773
Sample 2 (30 minutes)	5 (10)	3 (6)	5 (10)	0.714
Sample 3 (45 minutes)	6 (12)	6 (12)	1 (2)	0.121
Sample 4 (60 minutes)	3 (6)	4 (8)	7 (14)	0.359
Sample 5 (90 minutes)	1 (2)	11 (22)	3 (6)	0.001a
Sample 6 (120 minutes)	3 (6)	7 (14)	3 (6)	0.259

^aP value < 0.05 is considered significant. Cases may have more than one sample with growth hormone ≥ 10 ng/mL.

GH: Growth hormone; L-DOPA: Levodopa.