Table 3

The sensitivity analysis presents the risk of 30-day and 90-day mortality following IHT, categorised by the length of ICU stay from admission to the day of transfer

Risk of death for IHT by the length of ICU stay
ICU LOSExposureMortality30-day mortality90-day mortality
No (%)30-day
No (%)		90-day
No (%)		Unadjusted
HR with 95% CI		Adjusted
HR with 95% CI		Unadjusted
HR with 95% CI		Adjusted
HR with 95% CI
>6 days
 Non-IHT241 (65)70 (29)83 (34)1.0 (referent)1.0 (referent)1.0 (referent)1.0 (referent)
 IHT127 (35)25 (20)34 (27)0.62 (0.39 to 0.97)*0.42 (0.26 to 0.68)*0.70 (0.47 to 1.05)0.45 (0.29 to 0.69)*
>8 days
 Non-IHT187 (61)57 (31)69 (37)1.0 (referent)1.0 (referent)1.0 (referent)1.0 (referent)
 IHT118 (39)24 (20)33 (28)0.61 (0.38 to 0.98)*0.40 (0.24 to 0.67)*0.69 (0.45 to 1.04)0.43 (0.28 to 0.67)*
>10 days
 Non-IHT161 (60)49 (30)61 (38)1.0 (referent)1.0 (referent)1.0 (referent)1.0 (referent)
 IHT106 (40)22 (21)31 (29)0.63 (0.38 to 1.05)0.46 (0.27 to 0.78)*0.71 (0.46 to 1.09)0.49 (0.31 to 0.77)*
>12 days
 Non-IHT147 (60)44 (30)55 (37)1.0 (referent)1.0 (referent)1.0 (referent)1.0 (referent)
 IHT94 (40)21 (22)30 (32)0.71 (0.42 to 1.19)0.48 (0.28 to 0.85)*0.80 (0.51 to 1.25)0.53 (0.33 to 0.85)*

  • The analyses are presented as HR with 95% CI, using non-IHT patients as the reference group.

  • The models were adjusted for age, sex, body mass index categories (<30 or >30), Simplified Acute Physiology Score, Charlson Comorbidity Index (0, 1, >2), mechanical ventilation (yes/no), treatment limitations (yes/no) and SARS-CoV-2 wave (wave 1/waves 2–3).

  • *Statistically significant differences between groups, p<0.05.

  • ICU, intensive care unit; IHT, interhospital transfer; LOS, length of stay.