Table 3.

Observed survival rates for patients with TA-TMA among different risk groups

Risk group	Risk score	n (%)	6-mo survival/death, n/n	6-mo survival rate, %
Total cohort (N = 507)
Low risk	0-1	158 (31.1)	136/22	86.1
Intermediate risk	2-3	229 (45.2)	123/106	53.7
High risk	4-5	120 (23.7)	25/95	20.8
Derivation cohort (n = 269)
Low risk	0-1	83 (30.9)	72/11	86.7
Intermediate risk	2-3	130 (48.3)	66/64	50.8
High risk	4-5	56 (20.8)	6/50	10.7
Validation cohort (n = 238)
Low risk	0-1	75 (31.5)	64/11	85.3
Intermediate risk	2-3	99 (41.6)	57/42	57.6
High risk	4-5	64 (26.9)	19/45	29.7