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Table 1 Results of face and content validity of the instrument

From: Development and psychometric properties of a questionnaire to evaluate sustainable waste separation behavior and environmental health promotion

No. Item Impact score CVI CVR
Simplicity Relevancy Clarity
1 Waste separation requires lots of space. 3.04 0.91 1 1 1
2 Because recycling is poor, waste separation at home is not important and effective. 1.62 1 1 1 0.66
3 Because waste separation is of little economic value to the family, I do not separate wastes. 1.56 1 1 0.91 1
4 Because collection of wastes at home is time consuming, I do not separate wastes. 1.56 1 1 0.91 1
5 Because I need a separate trash can in the kitchen for separation, I do not separate wastes. 1.56 1 1 1 0.83
6 Moving the recyclables outdoors is difficult, especially in buildings without elevator. 1.56 1 1 1 0.66
7 Collecting recyclables causes an unpleasant odor. 1.62 1 1 0.91 0.66
8 Waste separation is difficult for apartment residents due to the small space and the shared staircase, elevator and yard. 1.68 0.91 0.91 0.83 0.5
9 Collecting recyclables causes disorder indoors and outdoors. 1.92 1 1 0.83 0.83
10 I like to separate wastes but I don't have the required space. 2.8 1 1 0.91 0.83
11 I get confused to figure out which trash can each type of waste should be put into. 1.51 1 1 0.83 0.83
12 Women do not have enough time to separate wastes. 1.74 1 1 0.91 0.83
13 Due to non-cooperation of the municipality in the collecting recyclables, I do not separate the wastes. 1.8 1 1 0.91 1
14 Due to the lack of a comprehensive recycling plan, even if I separate the wastes, the wastes are still disposed of together and the separation would be useless. 1.8 0.83 1 0.83 0.83
15 Because the refuse collectors are not justified in terms of recycling plan, even if I separate the wastes, the wastes are still disposed of together and the separation would be useless. 2.24 0.83 1 0.83 0.83
16 Because of the lack of recycling bins in neighborhoods or apartment complexes, I do not separate wastes. 2.4 1 1 0.91 1
17 Because refuse collectors do not come at my door to collect recyclables, I do not separate wastes. 1.86 1 1 0.83 0.66
18 I do not know the methods and phases of waste separation. 1.83 1 1 0.91 0.66
19 I do not know which part of the dry waste is recyclable and needs to be separated. 1.5 1 1 0.91 0.83
20 Waste separation at home is unpleasant to me. 1.51 0.91 0.91 0.75 0.66
21 I am not in the mood for waste separation. 1.62 1 1 0.91 0.83
22 I think separating waste at home is unnecessary and pointless. 1.56 1 1 0.91 1
23 Daily separation of waste is boring for me. 1.8 1 1 0.83 0.83
24 Busyness makes it impossible for me to separate wastes. 1.51 1 1 0.91 1
25 After a long working day and due to numerous house chores, waste separation is a difficult, daunting task. 1.62 0.91 0.91 0.91 0.33
26 I do not separate wastes because it is beyond my dignity. 1.62 0.91 1 0.91 0.66
27 Although I would like to separate wastes at home, I do not have enough time to do it. 2.38 0.91 1 0.91 0.66
28 Although I have enough time, I consider waste separation a waste of time and energy. 1.62 0.91 1 0.91 0.66
29 Environmental protection is not important to me. 3.87 0.91 1 0.91 0.83
30 I do not care what will happen to the collected wastes. 1.5 0.91 1 0.91 0.66
31 In my opinion, waste separation is the responsibility of certain organizations, not the citizens, and should be performed after the collection. 1.68 0.83 0.83 0.83 0.66
32 It is easier to carry unseparated wastes outdoors, so I do not separate wastes. 2.88 0.91 1 1 1
33 Because more garbage bags are required to be used at home, I do not separate wastes. 2.17 1 1 1 1
34 Because of the high cost of the garbage bag, I do not separate wastes. 1.83 1 0.91 1 0.66
35 I do not separate wastes because of laziness. 1.68 1 1 1 0.66
36 I do not separate wastes because it is troublesome. 1.62 1 1 1 0.33
37 Because I do not receive any money or goods in turn for the delivery of recyclables, I do not separate wastes at home. 2.38 1 1 0.91 0.83
38 My spouse or family members do not participate in waste separation, so I do not separate wastes. 1.62 1 1 0.91 1
39 Waste separation only by me does not have much impact on improving waste management. 1.56 1 1 0.83 1
40 The economic problems in our country take away the opportunity to think about the environment and its problems. 1.83 1 1 0.91 0.66
41 The real reason that authorities encourage people to separate wastes at home is to make more money for themselves. 1.68 1 1 0.91 1
42 Waste separation at home can reduce the pollution of the urban environment. 1.74 1 1 0.91 1
43 I separate wastes at home because I am worried about cutting down trees and destroying forests. 2.38 1 0.91 0.83 0.33
44 I separate wastes at home because I am worried about groundwater contamination. 2.96 1 0.91 0.91 0.33
45 I separate wastes at home because I'm worried about air pollution. 3.04 1 0.91 0.91 0.33
46 By separating wastes I want to retain a better world for my children and future generations. 3.96 1 1 0.91 1
47 To protect the environment, I always spend time separating wastes. 3.04 1 1 1 1
48 I get paid for the recyclables I deliver, so I always separate wastes at source. 1.74 1 1 1 0.83
49 If I do not separate wastes, I will seem to be irresponsible. 3.04 1 1 1 0.83
50 I performed waste separation so that they are reused as raw materials in the production cycle of factories. 2.24 1 1 1 0.83
51 I want to promote waste separation culture among others (children, other family members, neighbors, relatives, etc.) by separating waste at home. 1.68 1 1 0.91 0.83
52 I want to help create jobs in the community by separating waste at home. 1.83 0.91 0.91 1 0.83
53 I want to help reduce the amount of wastes in the city by separating waste at home. 2.31 1 1 1 1
54 I want to help postpone the filling of dumping areas by separating waste at home. 1.56 0.91 0.91 0.83 0.66
55 I help reduce the cost of waste transportation by the municipality through separating waste at home. 1.5 1 1 1 0.83
56 I intend to be more serious about waste separation at home in the future. 1.56 1 1 1 0.83