Figure 3

Mean scores of State Anxiety Scale as a function of time of day. Mean ± standard deviation of the mean for OD, 2NS, and 4NS groups for each time. Between groups comparisons: F_{(2, 56)} = 5.18, p = 0.009. Within OD group: F_{(3, 66)} = 5.92, p = 0.001 (1 > 3, 1 > 4, 2 > 4); within 2NS group: F_{(3, 57)} = 0.61, p = 0.610; within 4NS group: F_{(3, 45)} = 7.83, p < 0.001 (1 > 3, 1 > 4, 2 > 4). 2NS, two consecutive night shifts; 4NS, four consecutive night shifts; OD, off-duty.