Observed-predicted length of stay for an acute psychiatric department, as an indicator of inpatient care inefficiencies. Retrospective case-series study.

Table 5 Mean differences OLOS-PLOS¹ according to efficiency of care

Efficiency assessment	Mean	N	Std. Deviation	95% Confidence interval
Adequate	-4.1663	143	8.0234	-5.49 to -2.84
Impaired Efficiency	2.0541	44	10.0399	-1.00 to 5.11
Total	-2.7027	187	8.9134

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