Table 2.
Mean (range) spirometric data and demographics for the participating Middle Aged Danish Twins (MADT)
| Zygosity | N | Agea | PEFb | FEV1 | FVC | Heightc | Smokingd |
||
|---|---|---|---|---|---|---|---|---|---|
| Current (%) |
Ex (%) |
Never (%) |
|||||||
| MZ | |||||||||
| Males | 744 | 57.0 (50.6–63.6) | 482 (358–606) | 3.27 (2.59–3.95) | 4.07 (3.29–4.86) | 176 (170–183) | 29.2 | 29.6 | 41.2 |
| Females | 715 | 56.9 (50.5–63.6) | 325 (241–409) | 2.35 (1.84–2.87) | 2.93 (2.34–3.53) | 164 (158–170) | 44.9 | 15.8 | 39.3 |
| DZ | |||||||||
| Males | 726 | 56.8 (50.4–63.3) | 487 (361–613) | 3.31 (2.58–4.05) | 4.14 (3.31–4.98) | 177 (170–183) | 26.3 | 33.6 | 40.1 |
| Females | 681 | 56.7 (50.4–63.0) | 333 (249–417) | 2.41 (1.89–2.93) | 3.01 (2.36–3.66) | 165 (159–171) | 41.9 | 18.3 | 39.8 |
| DOS | |||||||||
| Males | 728 | 57.0 (50.8–63.3) | 480 (352–607) | 3.25 (2.49–4.00) | 4.07 (3.18–4.95) | 177 (170–184) | 25.5 | 32.2 | 42.4 |
| Females | 720 | 56.9 (50.6–63.2) | 330 (239–421) | 2.41 (1.87–2.95) | 3.03 (2.42–3.63) | 165 (159–171) | 41.6 | 22.5 | 35.8 |
| Males | 2,198 | 56.9 (50.6–63.2) | 483 (357–609) | 3.28 (2.55–4.00) | 4.09 (3.26–4.93) | 176 (170–183) | |||
| Current smokers | 880 | 56.9 (50.5–63.3) | 452 (326–578) | 3.10 (2.38–3.82) | 3.99 (3.15–4.83) | 176 (170–183) | |||
| Ex-smokers | 678 | 57.4 (50.9–64.0) | 497 (369–626) | 3.31 (2.57–4.04) | 4.10 (3.25–4.95) | 176 (169–183) | |||
| Never smokers | 576 | 56.1 (50.2–62.0) | 518 (408–627) | 3.52 (2.89–4.16) | 4.26 (3.47–5.05) | 176 (170–183) | |||
| Females | 2,116 | 56.8 (50.5–63.1) | 329 (243–416) | 2.39 (1.86–2.92) | 2.99 (2.37–3.61) | 165 (159–171) | |||
| Current smokers | 792 | 56.7 (50.4–63.0) | 308 (219–397) | 2.24 (1.71–2.77) | 2.88 (2.26–3.51) | 165 (158–171) | |||
| Ex-smokers | 391 | 57.8 (51.2–64.3) | 340 (254–426) | 2.38 (1.83–2.94) | 2.97 (2.36–3.59) | 165 (159–171) | |||
| Never smokers | 886 | 56.6 (50.4–62.8) | 343 (264–422) | 2.52 (2.05–2.99) | 3.08 (2.49–3.67) | 164 (159–170) | |||
| Total | 4,314 | 56.9 (50.6–63.2) | 407 (275–540) | 2.84 (2.07–3.62) | 3.55 (2.63–4.47) | 171 (162–179) | 34.8 | 25.4 | 39.8 |
MZ monozygotic twins, DZ same-sex dizygotic twins, DOS opposite sex dizygotic twins
a
Age is the mean age in years
b
PEF, FEV1, and FVC are calculated from the max value of the observed 1, 2, or 3 blows with PEF in L/min, FEV1 and FVC in L
c
Height is the mean height in cm
d
Smoking: shows distribution in percent of current smokers, ex-smokers, and never smokers in the different zygosity groups