condition mean min max ZT0-3 19.5434 14.74035 21.9471 ZT4-7 17.602800000000002 17.602800000000002 17.602800000000002 ZT8-11 25.5968 25.5968 25.5968 ZT12-15 29.312 27.3199 31.304100000000002 ZT16-19 24.0238 24.0238 24.0238 ZT20-23 28.08115 28.08115 28.08115