condition mean min max ZT0-3 5.8083025 5.299685 6.31692 ZT4-7 6.815200000000001 6.815200000000001 6.815200000000001 ZT8-11 4.381365 4.381365 4.381365 ZT12-15 0 0 0 ZT16-19 5.641675 5.641675 5.641675 ZT20-23 5.380265 5.380265 5.380265