condition mean min max ZT0-3 7.3016499999999995 6.0841449999999995 8.519155 ZT4-7 4.800575 4.800575 4.800575 ZT8-11 4.58254 4.58254 4.58254 ZT12-15 0 0 0 ZT16-19 5.852515 5.852515 5.852515 ZT20-23 6.51588 6.51588 6.51588