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Table 2 Performance in survey (number (and fraction) of correct answers) by type of spirometer used, number of spirometries requested during a regular week, and number of patients served by the GP

From: Spirometry in chronic obstructive pulmonary disease in Norwegian general practice

  Requested reversibility test Recognized non-sign. Reversibility test Suggested COPD as likely diagnosis Identified parameter FEV1/FVC ratio Identified parameter FEV11 in % of predicted
Type of spirometer used
 Welch-Allyn (n = 311) 231 (0.75) 288 (0.93) 252 (0.81) 167 (0.54) 124 (0.40)
 Spirare (n = 169) 129 (0.76) 159 (0.94) 143 (0.85) 69 (0.41) 80 (0.47)
 Other/Don’t know (n = 150) 107 (0.72) 135 (0.90) 117 (0.78) 51 (0.34) 65 (0.43)
p-value for difference, all groups 0.65 0.38 0.32 < 0.001 0.28
p-value for difference, excluding “Other/Don’t know” 0.70 0.54 0.33 0.01 0.11
Number of spirometries requested per week
 None (n = 70) 53 (0.76) 64 (0.91) 48 (0.69) 32 (0.46) 29 (0.41)
 1–4 (n = 403) 308 (0.77) 383 (0.95) 358 (0.89) 193 (0.48) 203 (0.50)
 5 or more (n = 30) 27 (0.90) 29 (0.97) 29 (0.97) 19 (0.63) 15 (0.50)
 Missing (n = 127) 79 (0.63) 106 (0.84) 77 (0.61) 43 (0.34) 22 (0.17)
p-value for difference, all groups < 0.01 < 0.001 < 0.001 0.01 < 0.001
p-value for trend, excluding “Missing” 0.23 0.20 < 0.001 0.20 0.25
Number of patients served by GP
 < 1000 (n = 181) 142 (0.79) 167 (0.92) 148 (0.82) 88 (0.49) 93 (0.51)
 1000–1499 (n = 294) 221 (0.75) 284 (0.97) 259 (0.89) 142 (0.48) 147 (0.50)
 ≥ 1500 (n = 33) 27 (0.82) 33 (1.00) 31 (0.94) 17 (0.52) 11 (0.33)
 Missing (n = 122) 77 (0.64) 98 (0.80) 74 (0.61) 40 (0.33) 18 (0.15)
p-value for difference, all groups 0.02 < 0.001 < 0.001 0.02 < 0.001
p-value for trend, excluding “Missing” 0.88 0.75 0.02 0.67 0.12
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