Table 1

Selected studies assessing layperson perceptions of generic medicines

Authors, date	Country	Sample	N	Substitution, %	Effectiveness, %	Quality, %	Side effects, %	Safety
Al-Gedadi et al, 200821	Malaysia	Lay	396		38.80	38.90	31.20
Babar et al, 20115	New Zealand	Lay	441		22.90		34.20
Bertoldi et al, 200523	Brazil	Lay	3182			30
Bradley et al, 199824	UK	Lay	2276	43.90
Costa-Font et al, 201425	Spain	Lay	2244	13.20
Dunne et al, 201426	Ireland	Lay	42		18	24		5
Figueiras et al, 200927	Portugal	Lay	819	40
Heikkilä et al, 201128	Finland	Lay	1844		19.10			15.50
Himmel et al, 200513	Germany	Lay	804			36.70
Ibrahim et al, 201229	Australia	Lay	503		13	13	5	15
Iosifescu et al, 200830	USA	Lay	315		15.60		11.60	20.10
Keenum et al, 201231	USA	Lay	172		23.30		13.40
Kobayashi et al, 201132	Japan	Lay	1215	46
Kohli and Buller, 201333	USA	Lay	160		17	28		9
Lebanova et al, 201234	Bulgaria	Lay	216		94	94		94
Lira et al, 201435	Brazil	Lay	278		20.9	14.4
Nardi et al, 201536	Brazil	Lay	5000		30.4
Omojasola et al, 201237	USA	Lay	525		6	7	29.60	3
Palagyi and Lassanova, 200838	Slovakia	Lay	1777		64	16.70
Perri et al, 199039	USA	Lay	326		13.50	11.40		6.70
Piette et al, 201040	USA	Lay	806		31.60			28.50
Rathe et al, 201341	Denmark	Lay	2476	14.50
Sansgiry and Bhosle, 200442	USA	Lay	505		10.92	7.40	5.08	6.08
Shrank et al, 200943	USA	Lay	1047	26.10			9.50
Sicras-Mainar and Navarro-Artieda, 201244	Spain	Lay (and physician)	203			33.20	42.30
Wong et al, 201445	Malaysia	Lay	202		23.8	23.3	23.8
Yousefi et al, 201546	Iran	Lay	1309	81	86		21.4

N reporting negative perceptions				3874	5274	2290	1054	942
Total N sampled				11 386	14 817	9119	5618	5242

Overall percentage				34.03	35.59	25.11	18.76	17.97