condition mean min max ZT0-3 3193.3500000000004 3193.3500000000004 3193.3500000000004 ZT4-7 3342.7 3342.7 3342.7 ZT8-11 3518.35 3518.35 3518.35 ZT12-15 3446.65 3446.65 3446.65 ZT16-19 3522.6 3522.6 3522.6 ZT20-23 3317.75 3317.75 3317.75