condition mean min max ZT0-3 24.2257 24.2257 24.2257 ZT4-7 14.3357 14.3357 14.3357 ZT8-11 10.2127 10.2127 10.2127 ZT12-15 21.15625 21.15625 21.15625 ZT16-19 39.94555 39.94555 39.94555 ZT20-23 28.88355 28.88355 28.88355