condition mean min max ZT0-3 0.400580618 0.397942864 0.403218372 ZT4-7 0.742381584 0.48216562350000003 1.0025975445 ZT8-11 6.717751427249999 2.3237575395 11.111745314999999 ZT12-15 14.948123962499999 14.367619515 15.52862841 ZT16-19 6.4014006084999995 4.7875042135 8.015297003499999 ZT20-23 1.4215263285000002 1.0414514005 1.8016012565000001