Table 1 Demographic factors of the study participants
Survey year | 1980 | 1995 | 2003 | Total |
|---|---|---|---|---|
No. | 39a | 40 | 90 | 169 |
Sampling period | ||||
 Mean ± SD | 1980.4 ± 0.7 | 1995.3 ± 0.8 | 2003 ± 0 | 1987.8 ± 7.5 |
 Range | 1979–1981 | 1994–1997 | 2003 | 1979–2003 |
 Q1 | 1979 | 1994 | – | 1980 |
 Q2 | 1981 | 1995 | – | 1988 |
 Q3 | 1981 | 1996 | – | 1995 |
Age (years) | ||||
 Mean ± SD | 42.4 ± 9.9 | 53.2 ± 10.1 | 36.2 ± 9.9 | 41.7 ± 12.0 |
 Range | 24–65 | 37–76 | 20–58 | 20–76 |
 Q1 | 37 | 44 | 29 | 32 |
 Q2 | 41 | 55 | 35 | 40 |
 Q3 | 51 | 61 | 44 | 50 |
Birth year | ||||
 Mean ± SD | 1937.9 ± 9.8 | 1942.1 ± 9.7 | 1966.8 ± 9.9 | 1954.1 ± 16.7 |
 Range | 1916–1957 | 1920–1958 | 1945–1983 | 1916–1983 |
 Q1 | 1930 | 1935 | 1959 | 1941 |
 Q2 | 1940 | 1941 | 1969 | 1954 |
 Q3 | 1944 | 1951 | 1974 | 1969 |
Height (cm) | ||||
 Mean ± SD | 150.5 ± 6.6 | 152.5 ± 5.6 | NA | NA |
 Range | 136.7–164.5 | 138.6–162.5 | NA | NA |
 Q1 | 136.7 | 138.6 | NA | NA |
 Q2 | 150.0 | 152.7 | NA | NA |
 Q3 | 154.9 | 157.1 | NA | NA |
Body weight (kg) | ||||
 Mean ± SD | 53.4 ± 7.1 | 57.6 ± 9.8 | NA | NA |
 Range | 43.5–72.0 | 42.8–78.2 | NA | NA |
 Q1 | 43.5 | 42.8 | NA | NA |
 Q2 | 52.0 | 55.6 | NA | NA |
 Q3 | 59.0 | 62.2 | NA | NA |
BMI (kg/m2) | ||||
 Mean ± SD | 23.6 ± 2.8 | 24.8 ± 4.2 | NA | NA |
 Range | 19.5–31.8 | 18.0–33.6 | NA | NA |
 Q1 | 24.8 | 27.0 | NA | NA |
 Q2 | 23.9 | 23.9 | NA | NA |
 Q3 | 21.9 | 21.6 | NA | NA |