Table S2. Plant-based diet indices scoring.
| Food | N (times/week) | Frequency | PDI | hPDI | uPDI |
| PDI, overall plant-based diet index; hPDI, healthful plant-based diet index; uPDI, unhealthful plant-based diet index; N=(W*4+M+Y/12)*D/48; W, times/week; M, times/month; Y, times/year; D, duration of time. | |||||
| Plant food group | |||||
| Healthy | |||||
| Fresh vegetable | N≥7.00 | Almost everyday | 5 | 5 | 1 |
| 1.00≤N<7.00 | ≥1 time/week | 4 | 4 | 2 | |
| 0.25≤N<1.00 | ≥1 time/month | 3 | 3 | 3 | |
| 0<N<0.21 | Occasionally | 2 | 2 | 4 | |
| N=0 | Rarely or never | 1 | 1 | 5 | |
| Fresh fruit | N≥7.00 | Almost everyday | 5 | 5 | 1 |
| 1.00≤N<7.00 | ≥1 time/week | 4 | 4 | 2 | |
| 0.25≤N<1.00 | ≥1 time/month | 3 | 3 | 3 | |
| 0<N<0.21 | Occasionally | 2 | 2 | 4 | |
| N=0 | Rarely or never | 1 | 1 | 5 | |
| Legumes | N≥7.00 | Almost everyday | 5 | 5 | 1 |
| 1.00≤N<7.00 | ≥1 time/week | 4 | 4 | 2 | |
| 0.25≤N<1.00 | ≥1 time/month | 3 | 3 | 3 | |
| 0<N<0.21 | Occasionally | 2 | 2 | 4 | |
| N=0 | Rarely or never | 1 | 1 | 5 | |
| Dried fruits and vegetables | N≥7.00 | Almost everyday | 5 | 5 | 1 |
| 1.00≤N<7.00 | ≥1 time/week | 4 | 4 | 2 | |
| 0.25≤N<1.00 | ≥1 time/month | 3 | 3 | 3 | |
| 0<N<0.21 | Occasionally | 2 | 2 | 4 | |
| N=0 | Rarely or never | 1 | 1 | 5 | |
| Staple food | N≥7.00 | Almost everyday | 5 | 5 | 1 |
| 1.00≤N<7.00 | ≥1 time/week | 4 | 4 | 2 | |
| 0.25≤N<1.00 | ≥1 time/month | 3 | 3 | 3 | |
| 0<N<0.21 | Occasionally | 2 | 2 | 4 | |
| N=0 | Rarely or never | 1 | 1 | 5 | |
| Spring onion, garlic | N≥7.00 | Almost everyday | 5 | 5 | 1 |
| 1.00≤N<7.00 | ≥1 time/week | 4 | 4 | 2 | |
| 0.25≤N<1.00 | ≥1 time/month | 3 | 3 | 3 | |
| 0<N<0.21 | Occasionally | 2 | 2 | 4 | |
| N=0 | Rarely or never | 1 | 1 | 5 | |
| Drink tea | Yes | Yes | 5 | 5 | 1 |
| No | No | 1 | 1 | 5 | |
| Less healthy | |||||
| Pickled vegetable | N≥7.00 | Almost everyday | 5 | 1 | 5 |
| 1.00≤N<7.00 | ≥1 time/week | 4 | 2 | 4 | |
| 0.25≤N<1.00 | ≥1 time/month | 3 | 3 | 3 | |
| 0<N<0.21 | Occasionally | 2 | 4 | 2 | |
| N=0 | Rarely or never | 1 | 5 | 1 | |
| Fried food | N≥7.00 | Almost everyday | 5 | 1 | 5 |
| 1.00≤N<7.00 | ≥1 time/week | 4 | 2 | 4 | |
| 0.25≤N<1.00 | ≥1 time/month | 3 | 3 | 3 | |
| 0<N<0.21 | Occasionally | 2 | 4 | 2 | |
| N=0 | Rarely or never | 1 | 5 | 1 | |
| Hot food | N≥7.00 | Almost everyday | 5 | 1 | 5 |
| 1.00≤N<7.00 | ≥1 time/week | 4 | 2 | 4 | |
| 0.25≤N<1.00 | ≥1 time/month | 3 | 3 | 3 | |
| 0<N<0.21 | Occasionally | 2 | 4 | 2 | |
| N=0 | Rarely or never | 1 | 5 | 1 | |
| Mildewed food | N≥7.00 | Almost everyday | 5 | 1 | 5 |
| 1.00≤N<7.00 | ≥1 time/week | 4 | 2 | 4 | |
| 0.25≤N<1.00 | ≥1 time/month | 3 | 3 | 3 | |
| 0<N<0.21 | Occasionally | 2 | 4 | 2 | |
| N=0 | Rarely or never | 1 | 5 | 1 | |
| Alcoholic beverage | Yes | Yes | 5 | 1 | 5 |
| No | No | 1 | 5 | 1 | |
| Animal food groups | |||||
| Meat, egg, dairy products | N≥7.00 | Almost everyday | 1 | 1 | 1 |
| 1.00≤N<7.00 | ≥1 time/week | 2 | 2 | 2 | |
| 0.25≤N<1.00 | ≥1 time/month | 3 | 3 | 3 | |
| 0<N<0.21 | Occasionally | 4 | 4 | 4 | |
| N=0 | Rarely or never | 5 | 5 | 5 | |