Table 2 Predictive model for fixed airflow limitation in smokers with no previous diagnosis of chronic obstructive pulmonary disease in primary health care.

From: A scoring system to detect fixed airflow limitation in smokers from simple easy-to-use parameters

Variable

Total n = 222 n(%)/x ± s

Fixed airflow limitation n = 57(25.7%) n(%)/x ± s

p-value

Adj. OR (95% CI)

p-value

Male gender

119(53.6)

37(31.1)

0.047

N/M

N/M

Age (years)

56.8 ± 10.4

63.8 ± 9.2

<0.001

1.08(1.03–1.14)

0.001

Educational level*:

   Primary

   Secondary

   University

78(35.1)

87(39.2)

57(25.7)

29(37.2)

19(21.8)

9(15.8)

0.011

1.03(0.61–1.75)

0.902

Fagerström test (dependence)*:

   Low

   Moderate

   High

90(40.5)

113(50.9)

19(8.6)

12(13.3)

33(29.2)

12(63.2)

<0.001

2.06(1.07–3.99)

0.032

   Smoking pack-years

28.8 ± 13.4

38.6 ± 11.8

<0.001

1.04(1.01–1.07)

0.021

   Respiratory symptoms

88(39.6)

41(46.6)

<0.001

4.36(2.01–9.46)

<0.001

Exacerbation*:

   Mild

   Moderate

   Severe

147(66.2)

67(30.2)

8(3.6)

22(15.0)

28(41.8)

7(87.5)

<0.001

N/M

N/M

   BMI (kg/m2)

26.6 ± 4.8

27.1 ± 5.8

0.387

N/M

N/M

  1. Abbreviations: Adj. O.R., adjusted odds ratio; B.M.I., body mass index; C.I., confidence interval; n(%), absolute frequency (relative frequency) N/M, not in the model; x ± s, mean ± standard deviation. *Analysed in the multivariate model as a quantitative variable. Goodness-of-fit of the multivariate model (likelihood ratio test): χ2 = 11.5, p < 0.001.