condition mean min max ZT0-3 41.89245 38.86405 44.92085 ZT4-7 44.1392 44.1392 44.1392 ZT8-11 57.5035 57.5035 57.5035 ZT12-15 0 0 0 ZT16-19 61.57805 61.57805 61.57805 ZT20-23 49.95325 49.95325 49.95325