| Kind | Value | annotation | ||
| enumeration | 1_absent or very weak | |||
| enumeration | 2_very weak to weak | |||
| enumeration | 3_weak | |||
| enumeration | 4_weak to medium | |||
| enumeration | 5_medium | |||
| enumeration | 6_medium to strong | |||
| enumeration | 7_strong | |||
| enumeration | 8_strong to very strong | |||
| enumeration | 9_very strong |