condition mean min max ZT0-3 17.087200000000003 17.087200000000003 17.087200000000003 ZT4-7 12.9104 12.9104 12.9104 ZT8-11 15.38765 15.38765 15.38765 ZT12-15 16.50725 16.50725 16.50725 ZT16-19 19.821350000000002 19.821350000000002 19.821350000000002 ZT20-23 17.539499999999997 17.539499999999997 17.539499999999997