condition mean min max ZT0-3 31.727075 29.203850000000003 34.250299999999996 ZT4-7 26.6193 26.6193 26.6193 ZT8-11 27.59565 27.59565 27.59565 ZT12-15 0 0 0 ZT16-19 30.3725 30.3725 30.3725 ZT20-23 32.4236 32.4236 32.4236