condition mean min max ZT0-3 3.13296 3.13296 3.13296 ZT4-7 3.96353 3.96353 3.96353 ZT8-11 3.39599 3.39599 3.39599 ZT12-15 3.20678 3.20678 3.20678 ZT16-19 3.29357 3.29357 3.29357 ZT20-23 3.8194 3.8194 3.8194