condition mean min max ZT0-3 31.048475 27.8874 34.20955 ZT4-7 27.480649999999997 27.480649999999997 27.480649999999997 ZT8-11 36.454800000000006 36.454800000000006 36.454800000000006 ZT12-15 0 0 0 ZT16-19 47.744 47.744 47.744 ZT20-23 33.30185 33.30185 33.30185