Table 3.

Summary of the different factors extracted with exploratory factor analyses.

Questionnaire Section	Factors Extracted from Factor Analysis	% Variance	KMO 1	Inter-Item Correlation	Cronbach Alpha/KR 20 2	Mean Factor Score	SD 3
Section B: Utilization practices B	Utilization of plastic identification codes	83.44	0.83	0.63	0.90	1.58	0.72
	Frequency of food consumption from plastic food packaging	35.87	0.76	0.31	0.78	3.19	0.62
Section C: Subjective knowledge C	Utilization practices	66.24	0.92	0.63	0.95	3.63	0.82
	Plastic buying decisions	61.43	0.77	0.52	0.84	2.69	0.82
Section D: Objective knowledge D	Freezing of various plastics	53.64	0.69	0.23	0.60	39%	0.30
	Freezing of cans and boxes			0.38	0.71	81%	0.28
	Plastic products not often used in the microwave	48.79	0.72	0.46	0.77	92%	0.21
	Plastic products most often used in the microwave			0.25	0.70	42%	0.26
	Use of plastic products in the dishwasher	44.79	0.78	0.35	0.81	65%	0.28
	Reuse practices of various plastic food packaging	33.38	0.77	0.31	0.80	67%	0.27
	Plastic products and exposure to extreme temperatures	42.03	0.85	0.36	0.86	72%	0.27
	Utilization of plastic and products containing plastic after exposure to sunlight	54.01	0.88	0.49	0.91	66%	0.34
	Release of chemicals from plastic products into foodstuffs	54.20	0.90	0.50	0.92	53%	0.36
	Illnesses/diseases and the use of plastic products	60.28	0.89	0.55	0.91	17%	0.28
	Plastic identification codes—reuse and recycle	65.47	0.61	0.42	0.59	12%	0.23
	Plastic identification codes—specific utilization practices			0.31	0.64	48%	0.42
	Bisphenol A (BPA) characteristics	46.55	0.84	0.38	0.85	43%	0.31
Section E: Information sources	Formal information sources	44.55	0.72	0.24	0.69	12%	0.19
	Informal information sources			0.41	0.73	42%	0.36
	Trust in formal information sources	57.63	0.83	0.43	0.81	3.76	0.58
	Trust in informal information sources			0.44	0.80	3.15	0.64

¹ KMO = Kaiser–Meyer–Olkin test for sampling adequacy. ² KR 20 = Kuder–Richardson 20 for knowledge and information source questions. ³ Standard deviation. ^B Utilization practice mean: Plastic identification codes: 1: Never; 2: Rarely; 3: Sometimes; 4: Always. Frequency of consumption mean: 1: Never; 2: Rarely; 3: Monthly; 4: Weekly; 5: Daily. ^C Subjective knowledge: 1 = Strongly disagree; 2 = Disagree; 3 = Neither agree nor disagree; 4 = Agree; 5 = Strongly agree. ^D Objective knowledge mean factor score presented as percentage correct response. ^E Information sources mean factor score presented as percentage “yes” responses to using a specific source.