condition mean min max ZT0-3 5.0616875 4.67586 5.447514999999999 ZT4-7 3.575665 3.575665 3.575665 ZT8-11 5.51806 5.51806 5.51806 ZT12-15 0 0 0 ZT16-19 5.35455 5.35455 5.35455 ZT20-23 5.712485 5.712485 5.712485