condition mean min max ZT0-3 584.244899 584.244899 584.244899 ZT4-7 569.162286 569.162286 569.162286 ZT8-11 532.827178 532.827178 532.827178 ZT12-15 559.3175895 559.3175895 559.3175895 ZT16-19 420.43319499999996 420.43319499999996 420.43319499999996 ZT20-23 550.9185295 550.9185295 550.9185295