Table 2.

Significant features identified on univariate analysis. Features with a CWS threshold with P < 0.05 (without adjustment for multiple comparisons) and generalization value > 0.75. The number of patients in each subgroup by feature threshold and the number and percentage of patients developing CWS in each subgroup are listed for reference. All features had missing values; therefore, the number of patients is <197 for each

Feature	Thresholds	Subpopulations risksa	P value
Rib dose to 1 cc	<4000 cGy	(N = 83, 1 CWS event; 1.2%) vs (N = 80, 8 CWS events; 10.0%)	0.010
Chest wall dose 30 cc	<1900 cGy	(N = 44, 0 CWS events; 0%) vs (N = 134, 11 CWS events; 32.4%)	0.035
Lung dose to 1000 cc	<70 cGy	(N = 70, 1 CWS event; 1.4%) vs (N = 126, 10 CWS events; 7.9%)	0.039
Rib Dmax	<5100 cGy	(N = 65, 1 CWS event; 1.5%) vs (N = 98, 8 CWS events; 8.2%)	0.050

^aPatient numbers do not add to 197 due to missing values present for select parameters.