condition mean min max ZT0-3 952.744294 952.744294 952.744294 ZT4-7 794.603785 794.603785 794.603785 ZT8-11 728.2472295 728.2472295 728.2472295 ZT12-15 614.8106935000001 614.8106935000001 614.8106935000001 ZT16-19 2333.79602 2333.79602 2333.79602 ZT20-23 2798.667327 2798.667327 2798.667327