condition mean min max ZT0-3 22.4961 21.27995 24.780299999999997 ZT4-7 20.56515 20.56515 20.56515 ZT8-11 29.85535 29.85535 29.85535 ZT12-15 34.889025 28.16125 41.6168 ZT16-19 29.536949999999997 29.536949999999997 29.536949999999997 ZT20-23 36.486850000000004 36.486850000000004 36.486850000000004