condition mean min max ZT0-3 33.790949999999995 31.448900000000002 36.132999999999996 ZT4-7 52.81005 52.81005 52.81005 ZT8-11 34.2275 34.2275 34.2275 ZT12-15 0 0 0 ZT16-19 18.682499999999997 18.682499999999997 18.682499999999997 ZT20-23 30.4365 30.4365 30.4365