condition mean min max ZT0-3 173.3738833333333 48.18965 260.4885 ZT4-7 50.73595 50.73595 50.73595 ZT8-11 55.301500000000004 55.301500000000004 55.301500000000004 ZT12-15 86.7296 63.86195 109.59725 ZT16-19 133.124 133.124 133.124 ZT20-23 258.73 258.73 258.73