condition mean min max ZT0-3 3.1707324999999997 3.162945 3.17852 ZT4-7 2.7028499999999998 2.7028499999999998 2.7028499999999998 ZT8-11 3.1163999999999996 3.1163999999999996 3.1163999999999996 ZT12-15 0 0 0 ZT16-19 3.6693 3.6693 3.6693 ZT20-23 4.028465000000001 4.028465000000001 4.028465000000001