Leicester stadiometer

We captured socio-demographic characteristics, occupational details, type of cooking fuel, tobacco use, alcohol use, and any current or past illness using a structured pilot-tested questionnaire. Respiratory symptoms were collected using the respiratory questionnaire of the British Medical Research Council [19 (link)]. Lung function was assessed using a portable spirometer (NDD EasyOne WorldSpirometer (https://www.ndd.ch). Height (portable plastic Tanita Leicester Stadiometer), weight (digital Tanita weighing machine HS-301) and blood pressure (digital instrument Omron HIT HEM 7300) were measured using standardized procedures by the same field investigator. Data collected in paper forms were entered into Microsoft excel sheets.

Height was measured using a portable Marsden Leicester stadiometer and weight using Tanita 352 scales according to standardised procedures, from which body mass index was calculated as weight (kg)/height (m)². Responses to the self-completion questionnaire provided additional information on: age at completing full-time education, self-rated health, smoking history, medication use and musculoskeletal, cardiovascular and respiratory conditions which might influence performance on the functional tests (S2 Appendix).