Table 4.

Coefficients of independent variables in regressions that showed statistically significant difference in δ₃ term

	Category	Independent variables a	Year −2	Year −1	Year 1
Work environment	Autonomy	improve	0.187c	0.199c	0.218c
			(0.007)	(0.009)	(0.008)
		trusted	0.172c	0.151c	0.137c
			(0.007)	(0.007)	(0.007)
	Perceived quality	satis	0.035c	0.049c	0.042c
			(0.011)	(0.010)	(0.011)
		recomd	0.115	0.113	0.111c
			(0.006)	(0.007)	(0.006)
		incident	0.035	0.040	0.040c
			(0.009)	(0.009)	(0.008)
	Team work	discusseff	−0.078c	0.006	0.008
			(0.009)	(0.005)	(0.006)
		teamcomm	−0.039b	0.036c	0.013
			(0.015)	(0.007)	(0.008)
	Support from organization	equal	0.169c	0.172c	0.176c
			(0.013)	(0.015)	(0.013)
		qualapp	0.082c	0.089c	0.095c
			(0.007)	(0.008)	(0.007)
		upprof	0.007	0.012b	0.006
			(0.006)	(0.006)	(0.006)
		supsup	0.217c	0.225	0.242c
			(0.006)	(0.006)	(0.006)
		commun	0.113c	0.112c	0.109c
			(0.009)	(0.009)	(0.008)
Drivers of job satisfaction	Job clarity	clearobj	0.062c	0.056c	0.057c
			(0.006)	(0.006)	(0.005)
		knowrep	0.057c	0.076c	0.048c
			(0.006)	(0.007)	(0.007)
	tension	wkpres	−0.080c	−0.078c	−0.076c
			(0.006)	(0.006)	(0.006)
		exthrs	0.013	0.034c	0.030c
			(0.008)	(0.008)	(0.008)
		stress	−0.085c	−0.067b	−0.078c
			(0.008)	(0.008)	(0.008)
		viopat	−0.063c	−0.054c	−0.062c
			(0.012)	(0.011)	(0.011)
		harpat	−0.034c	−0.049c	−0.027c
			(0.008)	(0.008)	(0.008)
		harcol	−0.111c	−0.114c	−0.114c
			(0.010)	(0.010)	(0.008)
Dummy variables	Mental health hospital	mh	0.068c	0.079c	0.079c
			(0.014)	(0.013)	(0.012)
	Occupation	medden	0.022	0.032b	0.049c
			(0.016)	(0.015)	(0.011)
		s&t	-	−0.043b	−0.054b
			-	(0.020)	(0.021)
		admingm	0.022	0.044c	0.034b
			(0.014)	(0.016)	(0.013)
		R-squared	0.664	0.672	0.679
		Observations	14,639	15,399	16,492

Note: cluster robust standard errors in parentheses. Baseline: 3 years before merger was approved by the regulator. Only statistically significant variables are displayed in the table.

^aDefinitions for each independent variable are shown in Table 1 (also see Additional file 1).

^b P < 0.05.

^c P < 0.01.