condition mean min max ZT0-3 33.690315 33.690315 33.690315 ZT4-7 32.560634 32.560634 32.560634 ZT8-11 31.602636 31.602636 31.602636 ZT12-15 33.0571035 33.0571035 33.0571035 ZT16-19 26.386566000000002 26.386566000000002 26.386566000000002 ZT20-23 28.194246 28.194246 28.194246