condition mean min max ZT0-3 28.374217 28.374217 28.374217 ZT4-7 27.9965575 27.9965575 27.9965575 ZT8-11 27.902883 27.902883 27.902883 ZT12-15 29.851906 29.851906 29.851906 ZT16-19 28.7336755 28.7336755 28.7336755 ZT20-23 32.542054 32.542054 32.542054