condition mean min max ZT0-3 1.7675125 1.756945 1.77808 ZT4-7 3.0305549999999997 3.0305549999999997 3.0305549999999997 ZT8-11 12.23605 12.23605 12.23605 ZT12-15 0 0 0 ZT16-19 8.232675 8.232675 8.232675 ZT20-23 4.001925 4.001925 4.001925