condition mean min max ZT0-3 22.71075 22.71075 22.71075 ZT4-7 31.74505 31.74505 31.74505 ZT8-11 17.35755 17.35755 17.35755 ZT12-15 14.06315 14.06315 14.06315 ZT16-19 16.1006 16.1006 16.1006 ZT20-23 20.17145 20.17145 20.17145