condition mean min max ZT0-3 23.77665 23.77665 23.77665 ZT4-7 15.78425 15.78425 15.78425 ZT8-11 13.7218 13.7218 13.7218 ZT12-15 15.992450000000002 15.992450000000002 15.992450000000002 ZT16-19 19.7094 19.7094 19.7094 ZT20-23 23.89045 23.89045 23.89045