Table 1

Number and proportion of non cooperating subjects at the spirometry tests, divided according to age and sex

Females
 Males
 Total
Age (yrs)
 Total
 Non cooperating
Total
 Non cooperating
Total
 Non cooperating






N
 %
N
 %
N
 %
3
 20
 2
 10.0
 29
 6
 20.7
 49
 8
 16.3*
4
 204
 9
 4.4
 230
 12
 5.2
 434
 21
 4.8
5
 200
 6
 3.0
 222
 8
 3.6
 422
 14
 3.3
6
 20
 1
 5.0
 35
 1
 2.8
 55
 2
 3.6
Tot
 450
 18
 4.0
 509
 27
 5.3
 960
 45
 4.7

* χ2= 11.68, p < 0.01

Piccioni et al. Respiratory Research 2007 8:14   doi:10.1186/1465-9921-8-14