condition mean min max ZT0-3 9.5945625 8.827835 10.36129 ZT4-7 4.84141 4.84141 4.84141 ZT8-11 4.5908 4.5908 4.5908 ZT12-15 0 0 0 ZT16-19 16.1597 16.1597 16.1597 ZT20-23 28.20445 28.20445 28.20445