We do this, because we want to use the categorisation of the individual data points to finally determine a meaningful segmentation in time, as already introduced above.
Within WHO, a recent report from the Tropical Diseases Research (TDR) Programme used the categorisation of Pasteur's Quadrant to describe the research conducted by the Programme [ 21].
We used the categorisation "severe cognitive impairment" for participants with scores 0-17 on the mini-mental state examination or with diagnosed dementia.
32 We used the categorisation employed for the public reporting of these data at the practice level 33 to define a binary indicator (yes/no) for 'positive experience of care'.
The sensitivity analyses demonstrated that our results were robust to the definition of cardiovascular drug count used, the categorisation of long-term conditions, and the exclusion of deaths (data not shown).
In THIN, we extracted smoking status data either using Read codes, 30 which were classified into non-smoker, ex-smoker and smoker with clinical input, or we used the categorisation (non-smoker, ex-smoker or current smoker) provided in the Additional Health Data.
BMI was categorised using the WHO categorisation (World Health Organization Consultation on Obesity, 1998): BMI <18.5 (underweight), 18.5 24.9 (normal), 25.0 29.9 (preobese/overweight) and ⩾30.0 (obese).
Body mass index was categorised using the WHO categorisation (World Health Organization Consultation on Obesity, 1998): BMI <18.5 (underweight), 18.5 24.9 (normal), 25.0 29.9 (preobese/overweight) and ≥30.0 kg/m (obese).
However, using the EPA categorisation, air quality was unhealthy or worse in 57 out of 64 (89%) of the pubs, and was hazardous in 26 (41%).
