condition mean min max ZT0-3 10.0595225 8.890365 11.22868 ZT4-7 13.98565 13.98565 13.98565 ZT8-11 18.8042 18.8042 18.8042 ZT12-15 0 0 0 ZT16-19 28.445999999999998 28.445999999999998 28.445999999999998 ZT20-23 22.12685 22.12685 22.12685