Table 4.
ILS prevalence in Japan, stratified by region
| Region | Number of participants (n) | Distribution of ILS prevalence [n (%)]* | ||||
|---|---|---|---|---|---|---|
| Yes | Think so | Do not think so | No | |||
| “Yes” and “think so” | “No” and “think so” | |||||
| Hokkaido and Tohoku | 504 | 57 (11.3) | 97 (19.2) | 136 (27.0) | 214 (42.5) | |
| 154 (30.6) | 350 (69.4) | |||||
| Kanto | 644 | 59 (9.2) | 125 (19.4) | 160 (24.8) | 300 (46.6) | |
| 184 (28.6) | 460 (71.4) | |||||
| Chubu | 376 | 31 (8.2) | 84 (22.3) | 98 (26.1) | 163 (43.4) | |
| 115 (30.6) | 482 (69.8) | |||||
| Kinki | 691 | 64 (9.3) | 145 (21.0) | 177 (25.6) | 305 (44.1) | |
| 209 (30.2) | 482 (69.8) | |||||
| Chugoku and Shikoku | 441 | 47 (10.7) | 93 (21.1) | 106 (24.0) | 195 (44.2) | |
| 140 (31.7) | 301 (68.3) | |||||
| Kyushu and Okinawa | 743 | 74 (10.0) | 167 (22.5) | 196 (26.4) | 306 (41.2) | |
| 241 (32.4) | 502 (67.6) | |||||
| Total | (n) | 3,399 | 1,043 | 2,356 | ||
| (%) | 100 | 30.7 | 69.3 | |||
*Based on question item 18—“Is your child’s mouth often open during the day?;” ILS incompetent lip seal