First, using a similar method reported in other studies [ 6, 7] occupational sitting time was categorised into tertiles of low (<360 minutes/day) moderate (360-420 minutes/dand, and high sitting time (421-840 minutes/day).
For instance, the statement "for some people in the early and middle stages of the disease, galantamine may help prevent some symptoms from becoming worse for a limited time" was categorised as "effective" by one person, "probably effective" by seven, "unknown effectiveness" by five, and "unclear" by three.
In Northern Ireland, the majority of family holidays taken during term time are categorised as an unauthorised absence.
When cumulative length of use and call time were categorised into quartiles according to distribution among the controls for each tumour type, as shown in Table 2, no increasing trend was found in risks of glioma, meningioma, or pituitary adenoma.
Self-reported time in bed, awakening time and bedtime were assessed for each adolescent by asking, "What time did you usually go to bed and wake-up last week?" The responses for awakening time were categorised as ≤5:00, 6 00, 7 00, 8 00 and ≥9 00 and the responses for bedtime were categorised as ≤21 00, 22 00, 23:00, 24:00, 1 00 and ≥2 00; numbers represent the military time of day.
Closure times were categorised as 'normal' or 'prolonged', defined objectively as the 90th centile of the distribution for all participants enrolled in the study.
Waiting times were categorised into <25 days (n=31 959), 25 to 38 days (reference, n=16 258) and 39 to 62 days (n=5472), so that the middle group was approximately within 1 week of the waiting standard of 31 days.
The high proportion of LHWs' time that was categorised as 'non-contact time' should not be seen as indicating poor productivity on the part of LHWs.
After tabulating smear results, the time interval was categorised in two periods that is, not delayed and delay in diagnosis.
Time period was categorised into recent years (2003-2005) and earlier years (1997-2002) based on the increase in reported SSI [ 8].
Age left full-time education was categorised as ≤16 years (UK age of compulsory education), ≥16 years and still in full-time education.
