| Model A | Total | ||
---|---|---|---|---|
Class I (< 52%)a | Class II (52–71%)a | Class III (≥ 71%)a | ||
Model B (MMI ≥ 20 mg/day) | ||||
 Class I + (< 36%)a | 15 | 8 | 0 | 23 |
20% (3/15)b | 38% (3/8)b | (–) |  | |
 Class II + (36–63%)a | 14 | 11 | 10 | 35 |
43% (6/14)b | 55% (6/11)b | 70% (7/10)b | Â | |
 Class III + (63–83%)a | 10 | 13 | 15 | 38 |
80% (8/10)b | 62% (8/13)b | 67% (10/15)b | Â | |
 Class IV + (≥ 83%)a | 0 | 6 | 12 | 18 |
(–) | 100% (6/6)b | 100% (12/12)b |  | |
 Total | 39 | 38 | 37 | 114 |
Model C (MMI < 20 mg/day) | ||||
 Class I + (< 21%)a | 61 | 0 | 0 | 51 |
13% (8/61)b | (–) | (–) |  | |
 Class II + (21–44%)a | 45 | 13 | 0 | 58 |
29% (13/45)b | 38% (5/13)b | (–) |  | |
 Class III + (44–63%)a | 30 | 21 | 4 | 55 |
60% (18/30)b | 52% (11/21)b | 50% (2/4)b | Â | |
 Class IV + (≥ 63%)a | 8 | 24 | 26 | 58 |
50% (4/8)b | 83% (20/24)b | 85% (22/26)b | Â | |
 Total | 144 | 58 | 30 | 232 |