condition mean min max ZT0-3 8.27989 8.27989 8.27989 ZT4-7 13.772666000000001 13.772666000000001 13.772666000000001 ZT8-11 14.5091465 14.5091465 14.5091465 ZT12-15 29.9441505 29.9441505 29.9441505 ZT16-19 9.244664499999999 9.244664499999999 9.244664499999999 ZT20-23 9.871359 9.871359 9.871359