Introduction
Methods
Data acquisition, FinEsS questionnaire and the Nordic EpiLung study
Applying medication reimbursement data
Comparing questionnaire- and register data
Definitions of other key study variables
Statistical analyses
Results
Helsinki and Western Finland cohorts
Whole population | ||||
---|---|---|---|---|
Helsinki (n = 3830) | Western Finland (n = 1849) | |||
Median | IQR | Median | IQR | |
Age (years) - Male - Female | 55 56 55 | 44–65 45–65 44–65 | 56 57 54 | 42–63 44–63 40–62 |
N | % | N | % | |
Female | 2164 | 56.8 | 973 | 52.6 |
Study population | ||||
Helsinki (n = 197) | Western Finland (n = 144) | |||
Median | IQR | Median | IQR | |
Age (years) - Male - Female | 59.0 59.0 59.0 | 50.0-68.0 45.5-68.0 50.0-66.2 | 59.0 62.0 58.0 | 45.8–65.0 48.0–66.0 41.0–65.0 |
BMI (kg/m2) - Male - Female | 26.0 25.7 26.1 | 23.0-29.7 23.6-28.8 22.8-30.1 | 27.9 28.7 27.4 | 24.4–31.5 25.6–33.0 23.2–30.3 |
N | % | N | % | |
Female | 132 | 67.7 | 83 | 57.6 |
Smoking - Current - Ex - Never | 33 76 88 | 16.8 38.6 44.7 | 22 56 65 | 15.4 39.2 45.5 |
Median | IQR | Median | IQR | |
Age at asthma diagnosis (years) | ||||
Time elapsed from self-reported asthma diagnosis | 19.0 | 9.0–28.0 | 18.0 | 8.8–26.0 |
Time elapsed from registered asthma diagnosis | 12.0 | 6.0–21.0 | 13.0 | 6.0–21.0 |
Self-reported age at asthma diagnosis | 40.0 | 29.0–51.0 | 40.0 | 24.8–50.0 |
N | % | N | % | |
Self-reported age at asthma diagnosis - <12 - 12–39 - ≥40 | 17 76 104 | 8.6 38.6 52.8 | 14 55 75 | 9.7 38.2 52.1 |
Medication | ||||
History of one or more R03 purchases | 183 | 92.9 | 129 | 89.6 |
Use of asthma medication | 186 | 94.4 | 131 | 91.0 |
Median | IQR | Median | IQR | |
Allergies, symptoms, and allergic heredity: | ||||
Physician-diagnosed allergic rhinitis | 102 | 51.8 | 64 | 44.4 |
Family history of asthma | 97 | 49.2 | 73 | 50.7 |
Asthma symptoms: | ||||
Attacks of breathlessness now or during the last 12 months | 152 | 77.2 | 114 | 79.2 |
Wheeze last 12 months | 113 | 57.4 | 84 | 58.3 |
Tightness in the chest last 12 months | 93 | 47.2 | 62 | 43.1 |
Hospitalization or visits to emergency department due to asthma exacerbation during last 12 months | 17 | 8.6 | 12 | 8.3 |
Overall agreement between self-reported and registered age at asthma diagnosis
Helsinki | Western Finland | |||||
---|---|---|---|---|---|---|
Total | Lack of allergy | Self-report within 10 years | Total | Lack of allergy | Self-report within 10 years | |
Bland-Altman agreement: Bias and [LoA] in years | −2.0 [− 19.0, 1.0] | −1.0 [− 14.9, 1.0] | −1.0 [− 2.5, 1.0] | −1.0 [− 20.9, 1.0] | −1.0 [− 8.1, 1.0] | 0 [− 4.0, 1.0] |
Intraclass correlation: ICC with [95% CI] | 0.826 [0.593, 0.909] | 0.897 [0.756, 0.933] | 0.989 [0.980, 0.994] | 0.866 [0.746, 0.922] | 0.947 [0.883, 0.972] | 0.991 [0.982, 0.996] |
Comparison of participants with good and poor agreement between self-reported and registered age at asthma diagnosis
Helsinki | Western Finland | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Good agreement*: n = 122 | Poor agreement**: n = 75 | Good agreement*: n = 112 | Poor agreement**: n = 32 | |||||||
Age at asthma diagnosis (years) | Median | IQR | Median | IQR | P | Median | IQR | Median | IQR | P |
Time elapsed from self-reported asthma diagnosis | 11.0 | 6.3–21.8 | 28.0 | 21.0-35.5 | < 0.001 | 15.0 | 7.0–23.0 | 26.5 | 19.0-33.2 | < 0.001 |
Time elapsed from registered asthma diagnosis | 10.5 | 5.3–19.8 | 15.0 | 9.0-24.5 | 0.023 | 13.5 | 5.8–22.0 | 12.0 | 6.0-18.2 | 0.429 |
Self-reported age at asthma diagnosis | 45.0 | 35.0–55.0 | 30.0 | 14.0–40.0 | < 0.001 | 43.0 | 29.5–52.0 | 30.0 | 7.8–40.0 | < 0.001 |
N | % | N | % | N | % | N | % | |||
Self-reported age at asthma diagnosis | ||||||||||
- < 12 | 1 | 0.8 | 16 | 21.3 | < 0.001 | 4 | 3.6 | 10 | 31.2 | < 0.001 |
- 12–39 | 42 | 34.4 | 34 | 45.3 | 43 | 38.4 | 12 | 37.5 | ||
- ≥ 40 | 79 | 64.8 | 25 | 33.3 | 65 | 58.0 | 10 | 31.2 |
Helsinki | Western Finland | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
< 10 years elapsed from self-reported asthma diagnosis | ≥ 10 years elapsed from self-reported asthma diagnosis | P | < 10 years elapsed from self-reported asthma diagnosis | ≥ 10 years elapsed from self-reported asthma diagnosis | P | |||||
Variable | Median | IQR | Median | IQR | Median | IQR | Median | IQR | ||
Difference between self-reported and registered diagnoses (years) | −1.0 | −1.0 to 0 | −5.0 | −12.0 to − 1.0 | < 0.001 | 0 | −1.0 to 0 | −2.0 | −6.5 to − 0.5 | < 0.001 |
N | % | N | % | N | % | N | % | |||
Categorized difference between self-reported and registered diagnoses | ||||||||||
- Good agreement (− 5 to 5 years) | 50 | 98.0 | 72 | 49.3 | < 0.001 | 40 | 97.6 | 72 | 69.9 | < 0.001 |
- Poor agreement ( < − 5 or > 5 years) | 1 | 2.0 | 74 | 50.7 | ≤ 3 | ≤ 7.3 | 31 | 30.1 |
Helsinki | Western Finland | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Good agreement*: n = 122 | Poor agreement**: n = 75 | Good agreement*: n = 112 | Poor agreement**: n = 32 | |||||||
N | % | N | % | P | N | % | N | % | P | |
Physician-diagnosed allergy: | ||||||||||
Allergic rhinitis | 49 | 40.2 | 53 | 70.7 | < 0.001 | 44 | 39.3 | 20 | 62.5 | 0.033 |
Allergic rhinitis due to pollen | 38 | 31.1 | 44 | 58.7 | < 0.001 | 37 | 33.0 | 17 | 53.1 | 0.062 |
Allergic rhinitis due to other factors | 34 | 27.9 | 41 | 54.7 | < 0.001 | 26 | 23.2 | 16 | 50.0 | 0.007 |
Allergic conjunctivitis | 32 | 26.2 | 32 | 42.7 | 0.025 | 25 | 22.3 | 11 | 34.4 | 0.247 |
Allergic dermatitis | 25 | 20.5 | 20 | 26.7 | 0.408 | 21 | 18.8 | 15 | 46.9 | 0.003 |
Heredity: | ||||||||||
Family history of asthma | 56 | 45.9 | 41 | 54.7 | 0.295 | 56 | 50.0 | 17 | 53.1 | 0.911 |
Family history of allergic rhinitis or conjunctivitis | 49 | 40.2 | 42 | 56.0 | 0.044 | 47 | 42.0 | 12 | 37.5 | 0.803 |
Asthma symptoms: | ||||||||||
Attacks of breathlessness now or during the last 12 months | 90 | 73.8 | 62 | 82.7 | 0.204 | 92 | 82.1 | 22 | 68.8 | 0.162 |
Longstanding cough during the last 12 months | 47 | 38.5 | 25 | 33.3 | 0.560 | 43 | 38.4 | 12 | 37.5 | 1.000 |
Sputum production | 62 | 50.8 | 41 | 54.7 | 0.705 | 74 | 66.1 | 15 | 46.9 | 0.078 |
Periods of sputum production for at least 2 consecutive years | 31 | 25.4 | 21 | 28.0 | 0.815 | 33 | 29.5 | 7 | 21.9 | 0.534 |
Recurrent wheeze | 30 | 24.6 | 33 | 44.0 | 0.007 | 36 | 32.1 | 9 | 28.1 | 0.829 |
Wheeze last 12 months | 61 | 50.0 | 52 | 69.3 | 0.012 | 69 | 61.6 | 15 | 46.9 | 0.198 |
Tightness in the chest last 12 months | 54 | 44.3 | 39 | 52.0 | 0.363 | 50 | 44.6 | 12 | 37.5 | 0.605 |
Dyspnea mMRC ≥ 2 | 45 | 36.9 | 39 | 52.0 | 0.053 | 47 | 42.0 | 14 | 43.8 | 1.000 |
Hospitalization or visits to emergency department due to asthma exacerbation during last 12 months | 9 | 7.4 | 8 | 10.7 | 0.591 | 10 | 8.9 | ≤ 3 | ≤ 9.4 | 1.000 |