condition mean min max ZT0-3 2.4247099999999997 2.4247099999999997 2.4247099999999997 ZT4-7 1.1951939999999999 1.1951939999999999 1.1951939999999999 ZT8-11 1.1582750000000002 1.1582750000000002 1.1582750000000002 ZT12-15 1.3704800000000001 1.3704800000000001 1.3704800000000001 ZT16-19 2.4252599999999997 2.4252599999999997 2.4252599999999997 ZT20-23 2.2566033333333335 2.2566033333333335 2.2566033333333335