Table 2.
Case-control study food items provided at a recruitment lunch event on 7 May 2011
| Food items | Cases (n = 12) | Controls (n = 29)† | OR (95% CI) | P value | ||
|---|---|---|---|---|---|---|
| Exposed | Unexposed | Exposed | Unexposed | |||
| Fried shrimp | 3 | 9 | 8 | 21 | 0·88 (0·14–5·0) | 1 |
| Tartar sauce | 1 | 11 | 3 | 26 | 0·79 (0·03–10·3) | 1 |
| Fried chicken | 8 | 4 | 13 | 14 | 2·2 (0·43–11·3) | 0·47 |
| Fried wing | 1 | 11 | 7 | 22 | 0·29 (0·01–2·9) | 0·4 |
| Chicken nugget | 5 | 7 | 10 | 17 | 1·2 (0·24–6·0) | 1 |
| Fried ham | 1 | 11 | 3 | 26 | 0·79 (0·03–10·4) | 1 |
| Fried squid | 7 | 5 | 7 | 21 | 4·2 (0·82–22·9) | 0·07 |
| Fried fish | 0 | 11 | 3 | 25 | 0 (0–6·2) | 0·55 |
| Croquette | 1 | 11 | 6 | 21 | 0·32 (0·01–3·4) | 0·4 |
| Baked egg | 4 | 7 | 4 | 25 | 0·5 (0·09–2·5) | 0·55 |
| Sausage | 3 | 8 | 8 | 19 | 0·89 (0·14–5·3) | 1 |
| Sweetened potato | 3 | 9 | 8 | 20 | 0·83 (0·13–4·8) | 1 |
| Potato and cheese | 5 | 2 | 7 | 3 | 1·1 (0·08–14·5) | 1 |
| Waffles | 2 | 10 | 13 | 16 | 0·25 (0·03–1·6) | 0·15 |
| Sandwiches | 8 | 3 | 22 | 7 | 0·85 (0·14–5·4) | 1 |
| Rice cake (dango, green bean paste) | 10 | 2 | 3 | 26 | 43·3 (4·9–547·5) | <0·01 |
| Rice cake (dango, red bean paste)* | 3 | 9 | 8 | 21 | 0·88 (0·14–5·0) | 1 |
| Rice cake (dango, sesame)* | 2 | 10 | 14 | 15 | 0·21 (0·03–1·4) | 0·08 |
| Rice cake (dango, soy sauce)* | 5 | 7 | 10 | 19 | 1·4 (0·28–6·6) | 0·73 |
| Rice cake (dango, coloured)* | 6 | 4 | 14 | 14 | 1·5 (0·28–8·3) | 0·72 |
| Potato chips | 7 | 5 | 19 | 10 | 0·74 (0·15–3·6) | 0·73 |
| Cheese and fish | 6 | 5 | 9 | 20 | 2·7 (0·52–14·1) | 0·27 |
| Rice cracker and peanuts | 3 | 8 | 10 | 19 | 0·71 (0·12–4·0) | 1 |
| Other snacks | 5 | 7 | 15 | 14 | 0·93 (0·22–4·0) | 0·83 |
| Tea | 8 | 4 | 24 | 4 | 0·33 (0·05–2·1) | 0·21 |
| Juice | 8 | 4 | 19 | 10 | 1·05 (0·21–5·5) | 1 |
| Other drinks | 8 | 4 | 10 | 18 | 3·6 (0·71–19·3) | 0·15 |
OR, Odds ratio; CI, confidence interval.
Dango is skewered, five small round rice cakes with one of four different types of syrup on top (soy sauce, sesame, green bean paste, or red bean paste).
*
These rice cakes were produced by manufacturers other than manufacturer A.
†
Controls are limited to those who attended the recruitment event on 7 May.