Summary of survey scores (median of Likert score was subtracted)
Question	mean	Sum of positives (Ps)	Sum of negatives (Ns)	(Ps-Ns)/(Ps+Ns)	Count of positives (Pc)	Count of negatives (Nc)	(Pc-Nc)/(Pc+Nc)
1	1.17	84	9	0.81	47	6	0.77
2	1.02	74	9	0.78	45	7	0.73
3	1.44	95	3	0.94	52	2	0.93
4	1.56	103	3	0.94	58	2	0.93

Pearson correlations of survey scores (and p-values)
	mean	(Ps-Ns)/(Ps+Ns)	(Pc-Nc)/(Pc+Nc)
mean	1 (0)	0.974 (0.026)	0.975 (0.025)
(Ps-Ns)/(Ps+Ns)	0.974 (0.026)	1 (0)	1 (0)
(Pc-Nc)/(Pc+Nc)	0.975 (0.025)	1 (0)	1 (0)

Kendall tau rank correlations of survey scores (and p-values)
	mean	(Ps-Ns)/(Ps+Ns)	(Pc-Nc)/(Pc+Nc)
mean	1 (0.083)	0.913 (0.071)	0.913 (0.071)
(Ps-Ns)/(Ps+Ns)	0.913 (0.071)	1 (0.056)	1 (0.056)
(Pc-Nc)/(Pc+Nc)	0.913 (0.071)	1 (0.056)	1 (0.056)