condition mean min max ZT0-3 47.0606098325 44.36639589 49.754823775 ZT4-7 73.501455705 65.93459487999999 81.06831653 ZT8-11 178.0743855375 131.79037587500002 224.35839520000002 ZT12-15 149.38261096 102.56284437 196.20237755 ZT16-19 60.14115674 51.0534927 69.22882078 ZT20-23 34.299873455000004 31.164125775 37.435621135000005