Table 3 Effect modification of variables on the association between week-one ratio of BUN/Albumin and risk of post-hospital mortality in critically ill surgical patients

1.750 (1.585–1.933)

0.792

1.505 (1.342–1.688)

0.982

1.711 (1.567–1.869)

1.615 (1.474–1.770)

2.105 (1.908–2.321)

< 0.001

1.696 (1.514-1.900)

0.004

1.648 (1.519–1.788)

1.482 (1.352–1.624)

1.671 (1.527–1.829)

0.115

1.479 (1.333–1.642)

0.302

1.853 (1.702–2.017)

1.580 (1.435–1.740)

1.988 (1.780–2.220)

< 0.001

1.838 (1.617–2.090)

< 0.001

1.489 (1.372–1.617)

1.478 (1.360–1.607)

1.905 (1.771–2.049)

< 0.001

1.675 (1.538–1.825)

< 0.001

1.312 (1.156–1.489)

1.202 (1.052–1.374)

1.868 (1.718–2.031)

0.083

1.568 (1.424–1.727)

0.421

1.653 (1.498–1.825)

1.523 (1.366–1.699)

2.623 (2.213–3.109)

0.927

2.391 (1.990–2.873)

0.064

2.447 (1.987–3.015)

1.826 (1.435–2.325)

1.400 (1.127–1.739)

1.287 (1.027–1.611)

2.189 (2.018–2.373)

< 0.001

1.832 (1.672–2.008)

< 0.001

1.214 (1.014–1.454)

1.226 (1.020–1.474)

2.068 (1.841–2.321)

0.010

1.707 (1.495–1.949)

0.108

1.701 (1.579–1.833)

1.511 (1.388–1.644)

2.045 (1.832–2.284)

< 0.001

1.679 (1.478–1.906)

< 0.001

1.427 (1.308–1.556)

1.281 (1.164–1.410)

1.875 (1.734–2.027)

0.096

1.621 (1.480–1.775)

0.113

1.673 (1.511–1.853)

1.443 (1.283–1.622)

1.322 (1.207–1.448)

< 0.001

1.201 (1.088–1.327)

< 0.001

2.387 (2.118–2.690)

1.926 (1.678–2.211)

1.594 (1.447–1.756)

0.003

1.483 (1.335–1.647)

0.094

1.943 (1.781–2.119)

1.617 (1.461–1.789)

3.656 (3.176–4.208)

< 0.001

3.236 (2.730–3.835)

< 0.001

1.380 (1.228–1.550)

1.353 (1.199–1.527)