condition mean min max ZT0-3 30.701023 30.701023 30.701023 ZT4-7 36.0787655 36.0787655 36.0787655 ZT8-11 46.995534000000006 46.995534000000006 46.995534000000006 ZT12-15 54.5656305 54.5656305 54.5656305 ZT16-19 254.14356800000002 254.14356800000002 254.14356800000002 ZT20-23 254.41453900000002 254.41453900000002 254.41453900000002