Relative attractiveness (RA) of total emanations (TE) of test person P1 versus a control (Expt. 1), his body odour (BO) versus his breath (BR) (Expt. 2), his body odour versus a control (Expt. 3) and his breath versus a control (Expt. 4). N: number of replicates, n: total number of mosquitoes collected by both treatments in each experiment. P: statistical significance level of (i) differences between the catches of treatment A and treatment B (RA = 0.5) or (ii) the change in the relative attractiveness of treatment A between different experiments (RA1 = RA2).