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Table 6 Model results – test data

From: Predicting length of stay from an electronic patient record system: a primary total knee replacement example

LoS grouping Proportion of admissions Total number of actual days stayed Total number of days difference (Model vs Actual) % difference in total number of days Predicting within 1 days accuracy Predicting within 2 days accuracy Predicting within 3 days accuracy
4 to 6 days 50.9% 500 158 31.6% 32.4% 67.6% 88.6%
Shorter LoS 17.3% 95 110 115.6% 0.0% 30.6% 58.3%
Longer LoS 31.8% 667 -180 -27.0% 25.4% 52.2% 68.7%
Total 100.% 1262 88 6.9% 24.5% 56.3% 76.9%