condition mean min max ZT0-3 18.146050000000002 18.146050000000002 18.146050000000002 ZT4-7 15.685199999999998 15.685199999999998 15.685199999999998 ZT8-11 9.985885 9.985885 9.985885 ZT12-15 11.7027 11.7027 11.7027 ZT16-19 21.5323 21.5323 21.5323 ZT20-23 22.9014 22.9014 22.9014