condition mean min max ZT0-3 371.828036 371.828036 371.828036 ZT4-7 105.1359175 105.1359175 105.1359175 ZT8-11 127.926286 127.926286 127.926286 ZT12-15 186.04785700000002 186.04785700000002 186.04785700000002 ZT16-19 289.5994975 289.5994975 289.5994975 ZT20-23 307.833706 307.833706 307.833706