condition mean min max ZT0-3 2.5642750000000003 2.5642750000000003 2.5642750000000003 ZT4-7 0.27169699999999997 0.27169699999999997 0.27169699999999997 ZT8-11 0.2766805 0.2766805 0.2766805 ZT12-15 0.515362 0.515362 0.515362 ZT16-19 1.720555 1.720555 1.720555 ZT20-23 3.677185 3.677185 3.677185