condition mean min max ZT0-3 1.24637719025 1.126722335 1.3660320455 ZT4-7 1.880957731 1.4910749189999999 2.2708405430000003 ZT8-11 2.410894412 2.226095429 2.595693395 ZT12-15 2.09692033225 2.0051304615 2.188710203 ZT16-19 2.072363717 1.5384927430000002 2.606234691 ZT20-23 3.84966431475 3.7504463975 3.948882232