condition mean min max ZT0-3 7.948379163249999 5.782217814 10.1145405125 ZT4-7 3.2945096837500003 2.017662269 4.5713570985 ZT8-11 1.5663892284999998 1.304350663 1.828427794 ZT12-15 2.77833450225 1.9561190935000001 3.600549911 ZT16-19 4.0280287895 3.4864299715 4.5696276075 ZT20-23 7.431983345999999 7.0168445335 7.8471221584999995