condition mean min max ZT0-3 3.0846925 2.572505 3.59688 ZT4-7 2.669345 2.669345 2.669345 ZT8-11 2.730715 2.730715 2.730715 ZT12-15 0 0 0 ZT16-19 2.0914099999999998 2.0914099999999998 2.0914099999999998 ZT20-23 1.92084 1.92084 1.92084