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Interpretation of quality of life scores from the St George's Respiratory Questionnaire

M. Ferrer, C. Villasante, J. Alonso, V. Sobradillo, R. Gabriel, G. Vilagut, J.F. Masa, J.L. Viejo, C.A. Jiménez-Ruiz, M. Miravitlles
European Respiratory Journal 2002 19: 405-413; DOI: 10.1183/09031936.02.00213202
M. Ferrer
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C. Villasante
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J. Alonso
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V. Sobradillo
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R. Gabriel
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G. Vilagut
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J.F. Masa
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J.L. Viejo
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C.A. Jiménez-Ruiz
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M. Miravitlles
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Tables

  • Table 1—

    Characteristics of the general population weighted sample

    CharacteristicsAllMF
    Patients n862533329
    Sex
     M48.5
     F51.5
    Age yrs
     40–4936.135.336.8
     50–5932.433.231.8
     60–6931.531.631.4
    Education
     High school or University42.548.865.3
     Primary school or no education56.751.234.7
    Social class (occupations)#
     I–II (professional/intermediate)18.123.213.1
     III (skilled nonmanual)32.030.733.2
    IV–V (manual)49.840.153.7
    Smoking behaviour
     Never smoker52.725.478.3
     Former Smoker24.141.57.8
     Smoker>20 pack-yrs13.124.12.9
     Smoker⩽20 pack-yrs10.09.010.9
    Respiratory diseases
     COPD10.216.04.8
     Asthma3.63.83.4
    Spirometric results
     FVC mL3454.5±877.74024.7±795.52916.9±552.2
     FEV1 mL2578.6±726.42959.5±762.82219.5±459.7
     % FVC over pred90.3±13.887.0±13.893.5±13.1
     % FEV1 over pred89.5±16.584.9±17.893.7±13.8
     FEV1/FVC %99.2±11.196.6±12.0101.6±9.4
    • Data are presented as % or mean±sd unless otherwise stated

    • M: male

    • F: female

    • COPD: chronic obstructive pulmonary disease

    • FVC: forced vital capacity

    • FEV1: forced expiratory volume in one second

    • #: social class based on an adaptation of the British General's Classification 26

  • Table 2—

    Distribution characteristics and reliability estimates of the St George's Respiratory Questionnaire scales in the general population weighted sample

    SymptomsActivityImpactsOverall
    Mean9.6713.404.738.41
    sd13.2417.639.9211.33
    Observed range0–92.80–1000–79.70–83.4
    % With worst possible score (floor)0.00.30.00.0
    %With best possible score (ceiling)41.243.559.521.1
    % With missing data#2.07.69.613.2
    % With missing score¶1.21.21.21.2
    Cronbach's Alpha+
     Probable case of COPD0.770.900.890.95
     Nonprobable case of COPD0.730.840.870.91
    Scale success rate %+
     Probable case of COPD81.384.492.388.0
     Nonprobable case of COPD87.571.994.286.0
    • n=862

    • COPD: chronic obstructive pulmonary disease

    • sd: standard deviation

    • COPD: chronic obstructive pulmonary disease

    • #: percentage of individuals with at least one missing item

    • ¶: percentage of individuals with missing score after handling missing data recommended by authors was applied

    • +: calculated separately for probable and nonprobable cases of COPD by using Multitrait Analysis Program because it is not possible to apply weights with this package

  • Table 3—

    Mean St George's Respiratory Questionnaire scale scores by demographical and clinical characteristics in the general population weighted sample

    SymptomsActivityImpactsOverall
    Sex
     M11.6212.175.238.60
     F7.8214.584.268.23
     p‐value<0.0010.0430.150.63
    Age yrs
     39–497.979.332.695.78
     50–598.7413.484.558.19
     60–6912.5417.957.2311.61
     p‐value<0.001<0.001<0.001<0.001
    Education
     High school or more8.549.263.106.05
     Primary school or no education10.4516.536.0210.20
     p‐value0.03<0.001<0.001<0.001
    Social class (occupations)#
     I‐II (professional/intermediate)9.559.462.966.23
     III (skilled nonmanual)7.9210.193.146.27
     IV‐V (manual)10.2915.935.649.79
     p‐value0.07<0.001<0.001<0.001
    Smoking behaviour
     Never smoker7.4913.634.167.81
     Former smoker9.5813.195.508.69
     Smoker⩽20 pack-yrs12.9911.583.387.76
     Smoker>20 pack-yrs16.1214.206.5910.76
     p‐value<0.0010.740.040.09
    % FEV1 over pred
     % FEV1≥1005.399.332.335.14
     90⩽ % FEV1<1008.239.172.806.01
     80⩽ % FEV1<909.1213.944.688.47
     % FEV1<8016.2021.149.2714.30
     p‐value<0.001<0.001<0.001<0.001
    • M: male

    • F: female

    • FEV1: forced expiratory volume in one second. n=862

    • #: social class based on an adaptation of the British Registrar General's Classification 26

  • Table 4—

    Adjusted associations between St George's Respiratory Questionnaire total score (dependent variable) and respiratory disease-related variables in the general population weighted sample

    BBetap‐value
    COPD1.220.030.40
    Asthma13.910.18**
    % FEV1 over pred−0.13−0.21**
    Interaction of COPD and % FEV1 over pred−0.19−0.11**
    Smoking behaviour
     Never smoker
     Former smoker−0.080.000.91
     Smoker≤20 pack-yrs2.600.09**
     Smoker>20 pack-yrs2.360.080.02
    Sex1.70.10**
    Age#0.10.11**
    Education1.40.080.02
    Interaction of age and asthma1.20.13**
    Constant5.0**
    • B: non standardized coefficient

    • Beta: standardized coefficient

    • COPD: chronic obstructive pulmonary disease

    • % FEV1 over pred: % force expiratory volume in one second over predicted n=862

    • #: age-centred

    • Coefficient of determination: (R2)=0.19 (adjusted R2=0.18)

    • **: p<0.01

  • Table 5—

    Percentiles (P) and means with standard deviation (sd) of the St George's Respiratory Questionnaire (SGRQ) scale scores by age

    40–4950–5960–69
    Symptoms
     P50.00.00.0
     P100.00.00.0
     P200.00.00.0
     P300.00.04.42
     P400.00.06.82
     P50/median4.246.8811.88
     P609.469.5515.16
     P7012.1712.7123.43
     P8016.4416.4429.11
     P9025.3232.4842.30
     P9532.6042.7949.93
    Mean±sd8.83±12.4110.34±14.3516.13±16.77
    Activity
     P50.00.00.0
     P100.00.00.0
     P200.00.00.0
     P300.00.00.0
     P400.00.00.0
     P50/median0.05.9711.16
     P605.9611.2116.87
     P7011.2117.3222.60
     P8017.1225.4535.19
     P9023.1336.9347.69
     P9529.3147.6160.37
    Mean±sd7.76±11.1512.69±16.5916.28±20.41
    Impacts
     P50.00.00.0
     P100.00.00.0
     P200.00.00.0
     P300.00.00.0
     P400.00.00.0
     P50/median0.00.02.30
     P600.03.554.77
     P700.05.477.75
     P805.039.2216.01
     P909.4814.6022.84
     P9515.1022.2738.77
    Mean±sd2.82±6.734.99±8.908.14±4.12
    Total
     P50.00.00.0
     P100.00.00.0
     P200.00.01.13
     P301.652.082.08
     P401.953.664.54
     P50/median2.725.486.98
     P603.676.6011.40
     P706.568.7514.13
     P809.7115.9319.58
     P9011.6523.3430.64
     P9522.6229.9746.58
    Mean±sd5.49±7.728.41±10.7412.17±14.89
    • Data are presented as SGRQ scale scores unless otherwise stated

    • Males from the general population weighted sample (n=533)

  • Table 6—

    Percentiles (P) and means with standard deviation (sd) of the St George's Respiratory Questionnaire (SGRQ) scale scores by age

    40–4950–5960–69
    Symptoms
     P50.00.00.0
     P100.00.00.0
     P200.00.00.0
     P300.00.00.0
     P400.00.02.32
     P50/median4.424.244.42
     P606.758.808.13
     P708.809.699.54
     P8012.1714.0814.29
     P9018.7919.2828.18
     P9539.2123.7644.79
    Mean±sd7.24±10.857.09±8.889.24±3.43
    Activity
     P50.00.00.0
     P100.00.00.0
     P200.00.00.0
     P300.00.00.0
     P400.00.05.96
     P50/median5.256.2112.19
     P6011.4112.2717.84
     P7017.1223.2829.31
     P8020.2829.3141.61
     P9035.1735.4747.69
     P9541.0854.4267.02
    Mean±sd10.81±13.9914.29±17.4319.36±22.62
    Impacts
     P50.00.00.0
     P100.00.00.0
     P200.00.00.0
     P300.00.00.0
     P400.00.00.0
     P50/median0.00.00.0
     P600.03.553.55
     P701.903.554.06
     P804.067.178.35
     P9010.6710.6415.43
     P9514.3820.4343.03
    Mean±sd2.62±5.634.10±7.646.38±13.25
    Total
     P50.00.00.0
     P100.00.00.0
     P200.00.01.28
     P300.801.782.17
     P402.172.823.34
     P50/median3.754.444.26
     P605.818.359.37
     P707.3810.9213.28
     P8010.9513.0417.76
     P9015.4017.9325.96
     P9521.0431.4649.99
    Mean±sd6.09±7.417.97±9.3511.05±14.83
    • Data are presented as SGRQ scale scores unless otherwise stated

    • Females from the general population weighted sample (n=329)

  • Table 7—

    Distribution characteristics of the St George’s Respiratory Questionnaire (SGRQ) scores according to sex in the subsample of chronic obstructive pulmonary diseas (COPD) patients, participants with history of asthma and healthy group

    SymptomsActivityImpactsOverall
    Healthy individuals
     M (n=143)7.63±10.83 (6.28–8.99)7.10±10.48 (5.78–8.41)2.36±5.02 (1.73–2.99)4.84±6.30 (4.05–5.63)
     F (n=164)6.49±9.57 (5.46–7.51)13.13±15.73 (11.45–4.81)3.47±7.66 (2.65–4.29)7.14±8.83 (6.19–8.08)
     p‐value#0.18*******
    COPD Patients
     M (n=275)22.55±18.01 (18.28–26.82)24.28±23.24 (18.75–29.81)12.82±15.94 (9.03–6.60)18.18±16.68 (14.21–22.15)
     F (n=78)12.43±13.9 (6.59–18.27)19.52±25.45 (8.83–30.20)8.05±13.11 (2.54–13.55)12.55±15.61 (6.00–19.10)
     p‐value#**0.420.210.17
    Asthma
     M (n=39)32.82±25.46 (20.34–45.28)29.24±25.91 (16.56–41.92)16.45±16.92 (8.16–24.74)23.15±19.52 (13.6–2.70)
     F (n=43)26.34±20.42 (16.19–36.49)29.53±26.69 (15.26–43.80)15.61±19.53 (5.89–25.33)21.68±20.68 (11.39–1.97)
     p‐value#0.440.980.890.84
    • Data are presented as mean±sd (95% confidence interval) unless otherwise stated

    • M: male

    • F: female

    • COPD: chronic obstructive pulmonary disease

    • #: comparison between SGRQ score from M and F

    • *: p<0.05

    • **: p<0.01

    • p<0.001

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Interpretation of quality of life scores from the St George's Respiratory Questionnaire
M. Ferrer, C. Villasante, J. Alonso, V. Sobradillo, R. Gabriel, G. Vilagut, J.F. Masa, J.L. Viejo, C.A. Jiménez-Ruiz, M. Miravitlles
European Respiratory Journal Mar 2002, 19 (3) 405-413; DOI: 10.1183/09031936.02.00213202

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Interpretation of quality of life scores from the St George's Respiratory Questionnaire
M. Ferrer, C. Villasante, J. Alonso, V. Sobradillo, R. Gabriel, G. Vilagut, J.F. Masa, J.L. Viejo, C.A. Jiménez-Ruiz, M. Miravitlles
European Respiratory Journal Mar 2002, 19 (3) 405-413; DOI: 10.1183/09031936.02.00213202
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