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Table 2 Weighted linear mixed models for falls and hospital acquired pressure ulcer ratesa

From: Nurse staffing and patient outcomes: a longitudinal study on trend and seasonality

Inpatient Falls
Variables Total Falls Injurious Falls
Coefficient (95 % CI) P-value Coefficient (95 % CI) P-value
 Trend–annual mean
  Change in total HPPD −0.36 (−0.51, −0.21) <0.001 −0.12 (−0.17, −0.07) <0.001
  Change in RN skill-mix (1 percentage point) −0.05 (−0.07, −0. 032) <0.001 −0.04 (−0.05, −0.03) <0.001
 Seasonal variation
  Change in total HPPD −0.18 (−0.24, −0.11) <0.001 −0.06 (−0.09, −0.03) <0.001
  Change in RN skill-mix (1 percentage point) 0.07 (0.05, 0.10) <0.001 −0.01 (−0.02, 0.00) 0.08
Hospital Acquired Pressure Ulcers
Variables All Stage III or Above
Coefficient (95 % CI) P-value Coefficient (95 % CI) P-value
 Trend–annual mean
  Change in total HPPD −1.82 (−2.56, −1.07) <0.001 −0.49 (−0.71, −0.26) <0.001
  Change in RN skill-mix (1 percentage point) −0.6 (−0. 20, −0.16) <0.001 −0.38 (−0.84, 0.86) 0.110
 Seasonal variation
  Change in total HPPD −1.80 (−2.02, −1.59) <0.001 −0.12 (−0.17, −0.07) <0.001
  Change in RN skill-mix (1 percentage point) 0.11 (0.01, 0.20) 0.03 −0.04 (−0.05, −0.03) <0.001
  1. aIntercepts and the estimated autocorrelation coefficients of autoregressive models of order 1 (AR1) are not shown in this table