Table 2 R squared values and percentages of variance explained per comorbidity index

CCI

0.042 [−0.034–0.118] (4.2%)

0.006 [− 0.024–0.036] (0.6%)

0.037 [− 0.035–0.109] (3.7%)

0.001 [− 0.011–0.013] (0.1%)

Original FCI

0.043 [− 0.034–0.120] (4.3%)

0.051 [− 0.032–0.134] (5.1%)

0.008 [− 0.026–0.042] (0.8%)

0.007 [− 0.025–0.039] (0.7%)

Weighted FCI

0.216 [0.075–0.357] (21.6%)

0.122 [0.003–0.241] (12.2%)

0.192 [0.055–0.329] (19.2%)

0.036 [− 0.035–0.107] (3.6%)

 CCI + age & gender

0.094 [− 0.011–0.199] (9.4%)

0.177 [0.046–0.308] (17.7%)

0.107 [− 0.004–0.218] (10.7%)

0.125 [0.008–0.242] (12.5%)

 Original FCI + age & gender

0.082 [− 0.018–0.342] (8.2%)

0.184 [0.051–0.317] (18.4%)

0.080 [− 0.019–0.179] (8.0%)

0.126 [0.008–0.244] (12.6%)

 w-FCI + age & gender

0.246 [0.104–0.388] (21.8%)

0.242 [0.101–0.383] (24.3)

0.227 [0.087–0.367] (22.7%)

0.137 [0.016–0.258] (13.7%)

 CCI + age, gender & function on admission

0.423 [0.282–0.564] (42.3%)

0.199 [0.065–0.342] (19.9%)

0.460 [0.323–0.597] (46.0%)

0.131 [0.013–0.249] (13.1%)

 Original FCI + age, gender & function on admission

0.423 [0.282–0.564] (42.3%)

0.207 [0.072–0.342] (20.7)

0.463 [0.326–0.600] (46.3%)

0.132 [0.014–0.250] (13.2%)

 w-FCI + age, gender & function on admission

0.487 [0.353–0.621] (48.7%)

0.291 [0.148–0.434] (29.1%)

0.470 [0.334–0.606] (47.0%)

0.160 [0.034–0.286] (16.0%)