Marga Hoogendoorn

78 Table 1. Baseline characteristics Patient factors (N=389): Included ICUs, nurses, and patients ICU admission type: Unplanned patients – n (%) Planned patients – n (%) 245 (68) 117 (32) Comorbidities: Diabetes Mellitus – n (%) Renal insufficiency – n (%) Cardiovascular insufficiency – n (%) Respiratory insufficiency – n (%) 68 (17.8) 24 (6.3) 16 (4.2) 7 (2.4) APS – Median (IQR) 68 [47.25 – 96.5] Age – Median (IQR) 66 [56 – 76] BMI – Median (IQR) 25.95 [23.6 – 28.7] In hospital mortality – n (%) 85 (22.3) Length of ICU stay in days– Median (IQR) 3.2 [0.9 – 14.8] Nurse factors: Numbers of patients per nurse 1 patient per nurse – n (%) 95 (40.4) >1 patients per nurse – n (%) 140 (59.6) Education level and level of experience nurses (N=228) Student nurse – n (%) 20 (8.8) Certified ICU nurse – n (%) 207 (91.2) Contextual factors: Type of hospital (N=8) Academic or teaching hospital – n (%) 6 (75.0) Non-teaching hospital– n (%) 2 (25.0) Kind of shift (N=226) Day – n (%) 84 (37.2) Evening – n (%) 77 (34.0) Night – n (%) 65 (28.8) Table 2 presents the mean Nursing Activities Scores and the NASA-Task Load Index scores per nurse. The Nursing Activities Score -score per patient was on average 41.3 points (SD 12.9), the mean score per nurse 67.8 points (SD 21.5). The perceived NASA-Task Load Index workload was on average 24.3 points per nurse (SD 9.1). In our models we used the mean Nursing Activities Score per nurse. If the nurse took care for more than one patient the mean score per nurse is the Nursing Activities Score of all the patients the nurse took care of during his or her shift. The mean Nursing Activities Score per nurse for