condition mean min max ZT0-3 0.3439894515 0.117329591 0.570649312 ZT4-7 1.3683504927499999 1.0873492765 1.649351709 ZT8-11 1.798676326 1.7437088385 1.8536438135000002 ZT12-15 2.7663888927499998 2.2046156679999998 3.3281621175 ZT16-19 2.8837315309999996 2.496487918 3.2709751439999994 ZT20-23 3.93343839975 3.727165821 4.1397109785