condition mean min max ZT0-3 26.080983333333336 19.0072 31.963250000000002 ZT4-7 17.3724 17.3724 17.3724 ZT8-11 15.59395 15.59395 15.59395 ZT12-15 23.0242 21.257849999999998 24.79055 ZT16-19 27.8748 27.8748 27.8748 ZT20-23 33.6151 33.6151 33.6151