Table 4.

Validation of diagnostic predictive scoring model

Variable	No. of ITP patients
	Internal validationcohort (n = 166)	External validation cohort (n = 171)
Total score
0	0/28 (0)	0/40 (0)
1	4/31 (12.9)	0/50 (0)
2	5/40 (12.5)	3/42 (7.1)
3	26/37 (70.3)	16/25 (64)
4	23/23 (100)	7/11 (63.6)
5	6/7 (85.7)	3/3 (100)
Diagnosis
Non-ITP (0–2)	9/99 (9)	3/132 (2.3)
ITP (3–5)	55/67 (82.1)	26/39 (66.7)

Values are presented as number (%). Data are total number of patients with ITP/total number of patients with that score. Scoring model: 1 point to high hemoglobin (> 12g/dL), low ferritin (≤ 177 ng/mL), normal lactate dehydrogenase (≤ upper limit of normal) and immature platelet fraction (IPF) ≥ 7 and < 10, 2 point to IPF ≥ 10.

ITP, immune thrombocytopenic purpura.