condition mean min max ZT0-3 18.341483333333333 16.9657 20.554949999999998 ZT4-7 14.2193 14.2193 14.2193 ZT8-11 13.273050000000001 13.273050000000001 13.273050000000001 ZT12-15 17.86935 16.92955 18.809150000000002 ZT16-19 17.06905 17.06905 17.06905 ZT20-23 22.8371 22.8371 22.8371