Table 2

Lengths-of-stay in hospital and ICU, by combination method
No combining of abstracts or records ≤ 1 day gaps ≤ 2 day gaps
Indication of inter-hospital transfer Indication of inter-hospital transfer
Used Not used Used Not used
Method 1 Method 2 Method 3 Method 4 Method 5
Hospital LOS (days)
 Mean ± SD 16.7 ± 33.6 21.5 ± 41.7 21.9 ± 43.8 21.5 ± 41.7 21.9 ± 42.1
 Difference vs. Method 1 -- 28.7% 31.1% 28.7% 31.1%
 Median (IQR) 8 (4–16) 9 (4–21) 9 (5–21) 9 (4–21) 9 (5–21)
 Difference vs. Method 1 -- 12.5% 12.5% 12.5% 12.5%
ICU LOS (hours)
 Mean ± SD 89.1 ± 141.8 98.8 ± 172.7 99.0 ± 173.0 100.3 ± 175.1 100.5 ± 175.3
 Difference vs. Method 1 -- 10.9% 11.1% 12.8% 12.9%
 Median (IQR) 48.8 (24.0-97.3) 53.3 (24.0-106.3) 53.3 (24.0-106.5) 54.2 (24.0-108.7) 54.3 (24.0-108.9)
 Difference vs. Method 1 -- 9.2% 9.2% 11.1% 11.3%

LOS, length-of-stay; SD, standard deviation; IQR, interquartile range.

Fransoo et al.

Fransoo et al. BMC Medical Research Methodology 2012 12:133   doi:10.1186/1471-2288-12-133

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