The comparisons of real wages cited are based on average rates for day labourers.
For the figures, see: Jan de Vries, The Industrious Revolution: Consumer Behavior and the Household Economy: 1650 to the Present, Cambridge et al. 2008, p. 83, Tab. 3.1; quoted from Stephen Broadberry / Bishnupriya Gupta: The Early Modern Great Divergence: Wages, Prices and Economic Development in Europe and Asia: 1500–1800, in: The Economic History Review 59, 1 (2006), pp. 2–31.