Liss GM and Tarlo SM, Peak expiratory flow rates in possible occupational asthma, Chest, 1991;100:63-69,

BOHRF Original Authors' Main Conclusions

The original authors' main conclusions are taken from Abstract, Results and Discussion. They are decided upon by the authors of the BOHRF occupational asthma guidelines and form part of the guidelines.

Objective criteria for interpretation of peak expiratory flow rate readings were assessed in 50 patients evaluated for suspected occupational asthma who had at least two weeks of PEFR readings and an objective diagnosis based on other investigations. The prevalence of occupational asthma was 36 percent. Peak flows were interpreted by two observers blinded to other results. Criteria for a PEFR interpretation of occupational asthma were as follow: diurnal variation greater than or equal to 20 percent relatively more frequently or with greater variation on working days than days off work. With the objective diagnoses as the gold standard, the sensitivity of the PEFR interpretations was 72 percent for OA; specificity for no asthma was 53 percent. Excluding those with greater than or equal to 20 percent variation on only one day sensitivity improved to 93 percent for OA, and specificity to 77 percent. There was an acceptable level of inter-observer variation (kappa 62 to 83 percent). We conclude that simple objective criteria for PEFR interpretation can be developed with acceptable inter-observer variation.

BOHRF Associated Evidence Statements

The BOHRF occupational asthma guidelines state that this reference is associated with the following evidence statements

** 3 There is high level of agreement between expert interpretations of serial peak flow records.

** 3 The sensitivity and specificity of serial peak flow measurements are high in the diagnosis of occupational asthma

Non Bohrf Information

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