Table 4.

Correlations of perceived nurse staffing level, fatigue, and nursing care quality with nurse staffing level-related variables (r,p).

Variables	Number of patients per nurse	Work intensity per nurse	Demanded nursing hours per nurse	Perceived insufficient nurse staffing level	Fatigue	Perceived nursing care quality
Number of patients per nurse	1
Work intensity per nurse	0.61 (<0.001∗∗)	1
Demanded nursing hours per nurse	0.88 (<0.001∗∗)	0.91 (<0.001∗∗)	1
Perceived insufficient nurse staffing level	0.27 (<0.001∗∗)	0.35 (<0.001∗∗)	0.35 (<0.001∗∗)	1
Fatigue	0.16 (0.035∗)	0.38 (<0.001∗∗)	0.32 (<0.001∗∗)	0.64 (<0.001∗∗)	1
Perceived nursing care quality	−0.25 (0.001∗)	−0.33 (<0.001∗∗)	−0.34 (<0.001∗∗)	−0.49 (<0.001∗∗)	−0.55 (<0.001∗∗)	1

r, Spearman's correlation;p, level of statistical significance.^∗Correlation is significant at the 0.05 level (2-tailed).^∗∗Correlation is significant at the 0.01 level (2-tailed).