condition mean min max ZT0-3 0.98456437 0.98456437 0.98456437 ZT4-7 1.017644 1.017644 1.017644 ZT8-11 1.8466550000000002 1.8466550000000002 1.8466550000000002 ZT12-15 1.3197975 1.3197975 1.3197975 ZT16-19 2.0315499999999997 2.0315499999999997 2.0315499999999997 ZT20-23 0.7503783333333334 0.7503783333333334 0.7503783333333334