Table 1.
Number of women aged 38 and 50 years who participated in the dental examinations of the Population Study of Women in Gothenburg, and mean and median number of teeth and standard deviation (SD) in the studies in 1968/69, 1980/81, 1992/93 and 2004/05 *
| 1968/69 | 1980/81 | 1992/93 | 2004/05 | ||
|---|---|---|---|---|---|
|
Age 38 |
Participants |
356 |
109 |
67 |
207 |
| Participation rate |
87.5% |
75.2% |
72.8% |
59.5% |
|
| Mean number of teeth |
22.2 |
24.9 |
28.1 |
29.0 |
|
| Median |
24.0 |
27.0 |
28.0 |
29.0 |
|
| |
SD |
7.0 |
5.9 |
2.2 |
2.5 |
|
Age 50 |
Participants |
390 |
323 |
98 |
293 |
| Participation rate |
89.4% |
76.4% |
77.2% |
57.7% |
|
| Mean number of teeth |
14.6 |
20.9 |
23.9 |
27.3 |
|
| Median |
17.0 |
23.0 |
26.0 |
28.0 |
|
| SD | 9.6 | 7.2 | 6.2 | 3.3 |
*Statistically significant differences (p < 0.05) concerning mean number of remaining teeth between all examinations and age groups except between 1992/93 and 2004/05 for the 38-year-olds.
The analyses of variance method was applied including a post-hoc analysis (LSD).