condition mean min max ZT0-3 26.441257 26.441257 26.441257 ZT4-7 51.9949895 51.9949895 51.9949895 ZT8-11 115.19274200000001 115.19274200000001 115.19274200000001 ZT12-15 20.419371 20.419371 20.419371 ZT16-19 30.7353515 30.7353515 30.7353515 ZT20-23 29.320968999999998 29.320968999999998 29.320968999999998