condition mean min max ZT0-3 15.095375 12.976600000000001 17.21415 ZT4-7 12.5999 12.5999 12.5999 ZT8-11 13.211 13.211 13.211 ZT12-15 0 0 0 ZT16-19 17.2544 17.2544 17.2544 ZT20-23 17.920650000000002 17.920650000000002 17.920650000000002