condition mean min max ZT0-3 3.6547 3.48084 3.82856 ZT4-7 4.677854999999999 4.677854999999999 4.677854999999999 ZT8-11 3.913645 3.913645 3.913645 ZT12-15 0 0 0 ZT16-19 4.732575 4.732575 4.732575 ZT20-23 5.5862099999999995 5.5862099999999995 5.5862099999999995