Table 1 Estimating the minimum detectable change (MDC₉₅) for difference scores in decision latitude over 4- and 2-year periods in the NPHS

	σ_t1	ρ	MDC₉₅	Change⩽error	Change>error
1994–2000 (n = 2941)
Decision latitude (4–20)	3.4	0.86	±3.5	74.5%	25.5%
2000–2002 (n = 3584)
Decision latitude (4–20)	3.0	0.86	±3.2	81.7%	18.3%

*ρ has been estimated by T-RT information from the OCHS.
NPHS, Canadian National Population Health Survey.