condition mean min max ZT0-3 14.439083333333334 13.348700000000001 16.3446 ZT4-7 15.788350000000001 15.788350000000001 15.788350000000001 ZT8-11 17.29285 17.29285 17.29285 ZT12-15 17.514075 17.100749999999998 17.9274 ZT16-19 16.0183 16.0183 16.0183 ZT20-23 14.6828 14.6828 14.6828