Figure 2. Effect of male age on mating duration of Propylea dissecta. 10 day-old males (green; Y = 118 + 7.91 x - 0.093 x2; r2 = 0.549; P < 0.001). 20 day-old males (blue; Y = 233 + 1.60 x - 0.094 x2; r2 0.632; P < 0.001). 30 day-old males (pink; Y = 215 - 0.05 x + 0.836 x2; r2 = 0.792; P < 0.001). Best fit lines..