Table 5.

Results of split-plot analysis of variance for the additional outcome.

	Intervention (n=63)		Control (n=63)		Test statistica,b	P value
	Baseline	Follow-up	Baseline	Follow-up
Number of late days in past month	0.7 (1.8)	0.4 (1.1)	0.8 (1.9)	0.7 (1.7)	0.48	.49
Number of early leave days in past month	0.3 (0.6)	0.1 (0.4)	0.3 (0.9)	0.3 (0.9)	0.74	.39
Number of absent days in past month	0.1 (0.2)	<0.1 (0.2)	<0.1 (0.1)	<0.1 (0.3)	0.49	.48

^aStatistics (F test) reported are for the interaction between intervention and time of each variable.

^bdegree of freedom: 1124.