Comorbidities of Idiopathic Thrombocytopenic Purpura: A Population-Based Study

Table 2

Distribution of number of controls per case.

Number of controls per case	Frequency (cases)	Percent	Cumulative percent
0	150	14.5	14.52
1	64	6.20	20.72
2	39	3.78	24.49
3	68	6.58	31.07
4	206	19.9	51.02
5	506	49.0	100.00