condition mean min max ZT0-3 21.41965 21.41965 21.41965 ZT4-7 18.003149999999998 18.003149999999998 18.003149999999998 ZT8-11 17.4008 17.4008 17.4008 ZT12-15 18.60555 18.60555 18.60555 ZT16-19 19.78725 19.78725 19.78725 ZT20-23 20.115099999999998 20.115099999999998 20.115099999999998