Table 4. Results of regression analyses on gabapentinoids prescribing rate

			Interaction IMD x STP	Interaction IMD x age
	QOF period	STP	Coefficient, P value (95% CI)	Coefficient, P value (95% CI)
QOF period	17/18	_	0.1382, 0.001	0.1382, 0.001
			(0.09546 to 0.1809)	(0.09546 to 0.1809)
	18/19	_	0.2444, 0.001	0.2444, 0.001
			(0.2017 to 0.2872)	(0.2017 to 0.2872)
	19/20	_	0.3315, 0.001	0.3315, 0.001
			(0.2887 to 0.3742)	(0.2887 to 0.3742)
	20/21	_	0.4088, 0.001	0.4088, 0.001
			(0.3660 to 0.4516)	(0.3660 to 0.4516)
STP	_	BC	–0.1078, 0.41	_
			(–0.3647 to 0.1492)
	_	SE	0.9920, 0.001	_
			(0.6958 to 1.2883)
QOF score (2016/17)	_	_	0.002115, 0.80	–0.00488, 0.58
QOF score (2016/17)			(–0.01456 to 0.01879)	(–0.02237 to 0.01261)
IMD score (2015)	_	_	0.01599, 0.01	0.03397, 0.001
IMD score (2015)			(0.003825 to 0.02816)	(0.02336 to 0.04457)
Proportion >65 (2016)	_	_	0.04276, 0.001	0.05077, 0.001
Proportion >65 (2016)			(0.02457 to 0.06096)	(0.03143 to 0.07012)
Interaction: STP x IMD score (2015)	_	BC	–0.00249, 0.81	_
			(–0.02301 to 0.01804)
	_	SE	0.1095, 0.001	_
			(0.08660 to 0.1323)
Interaction: proportion >65 (2016) x IMD score (2015)	_	_	_	0.0038, 0.001
Interaction: proportion >65 (2016) x IMD score (2015)				(0.001456 to 0.003780)

BC = Black Country and West Birmingham. CI= confidence interval. IMD = Index of Multiple Deprivation. QOF = Quality and Outcomes Framework. SE = Surrey and East Sussex. STP = sustainability and transformation partnership.