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Table 6 Duration of recall of age left school and start of job done for most of working life

From: Validity of two simple measures for estimating life-course socio-economic position in cross-sectional postal survey data in an older population: results from the North Staffordshire Osteoarthritis Project (NorStOP)

  n Number of years (range) Mean Standard deviation
Age left school
 Quantitative survey 7713 32–85 51.3 10.8
 Qualitative interview 18 40–73 53.1 9.1
Start of job done for most of working life     
 Quantitative survey 2558 6–83 45.4 13.3