Fig. 2

Percentage of past-year smokers or increasing and higher risk alcohol users reporting receipt of a brief intervention for smoking or alcohol—respectively—post-March 2020, overall and excluding those who did not visit their GP. BIs for smoking overall: N = 30,438; BIs for smoking: those who visited their GP: N = 19,300. BIs for alcohol overall: N = 21,771; BIs for alcohol: those who visited their GP: N = 14,146. Lines represent predicted point estimates from GAM allowing an interaction between slope and social grade, modelled non-linearly using a smoothing term with nine basis functions. Shaded areas represent 95% confidence intervals