Table 13.
Average onset year of symptoms and interval from the first symptom in each category of fish ingestion (n = 965).
| 3/day | 2/day | 1/day | ≥1/week | <1/week | |
|---|---|---|---|---|---|
| (n = 455) | (n = 269) | (n = 144) | (n = 79) | (n = 18) | |
| First symptom | 1974.2 ± 15.1 | 1975.6 ± 14.6 | 1978.2 ± 14.8 | 1977.7 ± 15 | 1982.5 ± 15.2 |
| >1968/case (%) | 277/455 (60.9) | 174/269 (64.7) | 105/144 (72.9) | 56/79 (70.9) | 15/18 (83.3) |
| Muscle cramps | 1978 ± 15.1 | 1980.6 ± 14.9 | 1981.7 ± 14.5 | 1980.9 ± 15.5 | 1986.4 ± 17 |
| case/N (=965) (%) | 428/455 (94.1) | 255/269 (94.8) | 133/144 (92.4) | 69/79 (87.3) | 14/18 (77.8) |
| >1968/case (%) | 308/428 (72.0) | 194/255 (76.1) | 108/133 (81.2) | 52/69 (75.4) | 11/14 (78.6) |
| First symptom-Muscle cramps | 4.6 ± 8.2 | 5.4 ± 10.4 | 4.9 ± 9.3 | 3.9 ± 6.3 | 5.7 ± 10.5 |
| Four limb numbness | 1981.3 ± 15.5 | 1984.6 ± 13.8 | 1987.5 ± 14.6 | 1990.2 ± 12.6 | 1991.8 ± 11.7 |
| case/N (=965) (%) | 430/455 (94.5) | 251/269 (93.3) | 129/144 (89.6) | 73/79 (92.4) | 15/18 (83.3) |
| >1968/case (%) | 339/430 (78.8) | 216/251 (86.1) | 111/129 (86.0) | 69/73 (94.5) | 15/15 (100) |
| First symptom-Four limb numbness | 7.6 ± 11.1 | 8.9 ± 11.6 | 9.6 ± 12.4 | 13.1 ± 14.4 | 9.5 ± 13.1 |
| Stumbling tendency | 1987.2 ± 13.9 | 1988.9 ± 14.1 | 1990.6 ± 12.5 | 1994.5 ± 11.5 | 1993.8 ± 10.5 |
| case/N (=965) (%) | 368/455 (80.9) | 206/269 (76.6) | 112/144 (77.8) | 48/79 (60.8) | 10/18 (55.6) |
| >1968/case (%) | 332/368 (90.2) | 185/206 (89.8) | 105/112 (93.8) | 48/48 (100) | 10/10 (100) |
| First symptom-Stumbling tendency | 14.3 ± 13.0 | 14.2 ± 13.8 | 13 ± 13.2 | 18.9 ± 16.2 | 14.5 ± 15.2 |
| Difficulty in fine finger tasks | 1985.4 ± 13.6 | 1986.3 ± 14.4 | 1989.1 ± 14.2 | 1989.1 ± 14.4 | 1996.9 ± 8.4 |
| case/N (=965) (%) | 320/455 (70.3) | 168/269 (62.5) | 82/144 (56.9) | 40/79 (50.6) | 8/18 (44.4) |
| >1968/case (%) | 284/320 (88.8) | 147/168 (87.5) | 73/82 (89.0) | 36/40 (90.0) | 8/8 (100) |
| First symptom-Difficulty in fine finger tasks | 13.1 ± 12.3 | 13 ± 12.7 | 13.9 ± 13.9 | 13.1 ± 13.7 | 12.5 ± 16.7 |
| Limited peripheral vision | 1989.7 ± 12.8 | 1990.8 ± 13.3 | 1991.8 ± 12.9 | 1991.3 ± 16.1 | 1993.8 ± 13.8 |
| case/N (=965) (%) | 302/455 (66.4) | 165/269 (61.3) | 80/144 (55.6) | 36/79 (45.6) | 8/18 (44.4) |
| >1968/case (%) | 281/302 (93.0) | 155/165 (93.9) | 77/80 (96.3) | 33/36 (91.7) | 8/8 (100) |
| First symptom-Limited peripheral vision | 17.5 ± 12.9 | 17.3 ± 13.7 | 16.3 ± 13.4 | 19.1 ± 14.3 | 13.1 ± 16.3 |