Number of times garden watered in past 7 days. Scatter plot (Bland-Altman plot) of diary response minus CATI response (vertical axis) against average of CATI response and diary response (horizontal axis). The centre full horizontal line corresponds to the average difference and upper and lower full horizontal lines correspond to the 95% limits of agreement. The dashed straight line represents the line of zero difference. The larger the data points (circles) the higher the number of households that recorded these values.