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. 2020 Sep 9;15(9):e0238050. doi: 10.1371/journal.pone.0238050

Table 2. Leftovers selected and saved as a percent of items, by food, meal and participant characteristics.

Categories Leftovers Selected N Leftovers Saved Among Items not Fully Consumed N
Total: % of Items 12.15% 1,177 24.37% 197
    [% of calories] [9.71%] [28.06%]
By Food Type (p = 0.001***) (p = 0.567)
    Baked Products 10.09% 109 21.05% 19
    Breakfast Cereals, Grains, & Pasta 16.25% 80 35.71% 14
    Dairy & Egg Products 8.23% 158 23.53% 17
    Fast Foods & Restaurant Foods 7.06% 85 10.34% 29
    Fruits & Fruit Juices 6.90% 87 23.08% 13
    Nut, Seeds, & Legumes 5.17% 58 0.00% 3
    Fats, Oils, Soups, Sauces, Gravies,
    Spices, & Herbs
11.50% 113 22.58% 31
    Meats & Meat Products 16.03% 156 33.33% 24
    Sweets 5.26% 76 20.00% 10
    Vegetables & Vegetable Products 19.22% 255 32.43% 37
By Eating Occasion (p<0.000***) (p = 0.563)
    Breakfast 4.78% 251 12.90% 31
    Morning Snack 0.00% 25 33.33% 3
    Lunch 19.11% 429 26.14% 88
    Afternoon Snack 9.26% 54 16.67% 6
    Dinner 10.88% 377 28.36% 67
    Evening Snack 7.32% 41 0.00% 2
By Day of the Week (p<0.000***) (p = 0.016**)
    Monday 23.75% 160 12.20% 41
    Tuesday 8.33% 168 40.63% 32
    Wednesday 13.94% 165 33.33% 24
    Thursday 10.11% 188 34.62% 26
    Friday 12.74% 157 33.33% 18
    Saturday 10.80% 176 13.79% 29
    Sunday 6.15% 163 11.11% 27
By Gender (p<0.000***) (p = 0.420)
    Female 10.47% 993 24.62% 195
    Male 21.20% 184 0.00% 2
By Age (p<0.000***) (p = 0.001***)
    < 40 2.65% 113 10.00% 40
    40–49 7.17% 321 34.62% 26
    50–59 13.10% 580 20.39% 103
    60 and older 25.15% 163 50.00% 28
By an Item’s Waste Rate (p = 0.149) (p = 0.104)
    None 13.16% 980 20.27% 148
    <25% 8.47% 59 40.00% 35
    25% - 49.9% 7.14% 56 27.27% 11
    50% - 74.9% 3.36% 55 33.33% 3
    75% or more 11.11% 27 20.27% 148
By Calories Selected for Occasion (p = 0.000***) (p = 0.032**)
    <250 4.63% 216 21.74% 23
    250–499 10.00% 320 16.28% 43
    500–749 21.01% 338 12.82% 39
    750 or more 9.90% 303 33.70% 92

Example interpretations are as follows (see line for baked products): 10.09% of the 109 baked product items selected by respondents for meals were identified as leftovers while 21.05% of the 19 baked product items that were selected but not fully consumed were being saved to become a leftover. p-values are from chi-square tests of association within each category.