Table 1.
Characteristics of Study Members Who Completed the Dental Questionnaire at 15, 18, and 26 yrs Compared with Those Who Missed One or More Years
| Included Number (%) | Excluded Number (%)a | Overall Number (%)a | |
|---|---|---|---|
| Gender | |||
| Male | 377 (50.9) | 158 (53.4) | 535 (51.6) |
| Female | 364 (49.1) | 138 (46.6) | 502 (48.4) |
| Childhood SES* | |||
| High | 120 (16.2) | 47 (16.2)b | 167 (16.1) |
| Medium | 490 (66.1) | 159 (54.8) | 649 (62.6) |
| Low | 131 (17.7) | 84 (29.0) | 215 (20.7) |
| Unknown | 6 | 6 | |
| Smoking at ages 21 and 26 yrs | |||
| No | 504 (68.0) | 145 (60.9)c | 649 (66.3) |
| Yes | 237 (32.0) | 93 (39.1) | 330 (33.7) |
| Missing | 58 | 58 | |
| Deceased by 26 yrs | 18 (6.1) | 18 (1.8) | |
| Totald | 741 (71.0) | 296 (29.0) | 1037 |
a
Valid %.
b
P < 0.001.
c
P < 0.05.
d
Percent by row.
*
SES = socio-economic status.