questionnaire
[13]); LBP which made it difficult or impossible to
put on hosiery; attacks of cold-induced finger blanching;
and tingling or numbness in the digits. Analysis was
confined to those who held a job at the time the questionnaire
was completed. The occupations of participants
were classified according to the Standardised Occupational
Classification 1990 or ‘SOC90’ [14]. Directly
standardized estimates of the prevalence of regional pain
(or exposure, as in Table 2) were calculated for farm
workers, farm owners and farm managers (SOC90 unit
groups 160, 169 and 900–902; n = 122) and compared
with other blue-collar workers (n = 2424) and whitecollar
workers (n = 2228). The results on health are
presented below.