Fig. 1.

Family income quantile regression estimates for norovirus exposure model M1.

*Fig. 1 legend: Fig. 1 has a horizontal quantile scale and the vertical scale in norovirus antibody level (log) indicates the family income effect. The solid black line (‘QR coeff’) is the quantile regression estimate of income at each quantile; the dark grey (‘QR UL’) and the light grey (‘QR LL’) solid lines are the upper limit and lower limit, respectively, of the 95% confidence intervals of the quantile estimates. Ordinary least squares estimates - black dashed line ‘OLS coeff’ - and their 95% confidence intervals (dark and light grey dashed lines ‘OLS UL’ and ‘OLS LL’) are reported as a way of comparison.