condition mean min max ZT0-3 28.923524999999998 27.264 30.58305 ZT4-7 11.98625 11.98625 11.98625 ZT8-11 6.695495 6.695495 6.695495 ZT12-15 0 0 0 ZT16-19 15.8749 15.8749 15.8749 ZT20-23 21.73335 21.73335 21.73335