condition mean min max ZT0-3 3.6266800000000003 2.44202 4.81134 ZT4-7 6.95756 6.95756 6.95756 ZT8-11 4.6561699999999995 4.6561699999999995 4.6561699999999995 ZT12-15 0 0 0 ZT16-19 6.765815 6.765815 6.765815 ZT20-23 6.83067 6.83067 6.83067