condition mean min max ZT0-3 34.4251 34.4251 34.4251 ZT4-7 30.92415 30.92415 30.92415 ZT8-11 21.2531 21.2531 21.2531 ZT12-15 20.72045 20.72045 20.72045 ZT16-19 25.8027 25.8027 25.8027 ZT20-23 29.50505 29.50505 29.50505