Table 4. Facility-level WSC DID analysis results.

Dependent variables	Baseline	Follow-up	Difference 1	DID
WSC total score (SE)
Intervention	N = 9	N = 9
	31.1(0.87)	32.3(0.81)	1.2 (0.85) (p = 0.17)
Control	N = 10	N = 10
	31.4(0.57)	31.6(0.42)	0.2 (0.31) (p = 0.61)
Difference 2	−0.3(1.02)	0.7(0.89)		1.0 (0.9)
	(p = 0.75)	(p = 0.38)		(p = 0.24)
Horizontal WSC score (SE)
Intervention	N = 9	N = 9
	19.4(0.43)	19.9(0.50)	0.5 (0.36) (p = 0.21)
Control	N = 10	N = 10
	19.5(0.37)	19.6(0.27)	0.1(0.27) (p = 0.57)
Difference 2	−0.1(0.57)	0.3(0.56)		0.4 (0.45)
	(p = 0.94)	(p = 0.6)		(p = 0.46)
Vertical WSC score (SE)
Intervention	N = 9	N = 9
	11.6(0.46)	12.4(0.33)	0.8(0.51) (p = 0.16)
Control	N = 10	N = 10
	11.9(0.23)	11.9(0.23)	0(0.09) (p = 0.9)
Difference 2	−0.3(0.49)	0.5(0.4)		0.8(0.52)
	(p = 0.57)	(p = 0.21)		(p = 0.16)

* Welch's t test was used when two samples had unequal variances. Paired t test was only used to test the differences between the baseline and follow-up WSC scores.

*The values in the brackets are SEs.

*Difference1 =  Follow-up – Baseline; Difference 2 =  intervention – control; DID =  Difference 1 (intervention)-Difference 1 (control).