condition mean min max ZT0-3 1.2771979975 1.060314484 1.4940815109999999 ZT4-7 1.4990288192499999 1.1258928685 1.87216477 ZT8-11 2.54821602325 2.2954836195 2.800948427 ZT12-15 2.5820572022499997 2.3888249955 2.775289409 ZT16-19 1.56348118375 1.4651769749999999 1.6617853925000001 ZT20-23 1.51646169075 1.1279452825 1.904978099