condition mean min max ZT0-3 4.796905000000001 4.680155 4.913655 ZT4-7 3.7802249999999997 3.7802249999999997 3.7802249999999997 ZT8-11 8.01642 8.01642 8.01642 ZT12-15 0 0 0 ZT16-19 10.741 10.741 10.741 ZT20-23 7.8304350000000005 7.8304350000000005 7.8304350000000005