condition mean min max ZT0-3 37.79865 37.79865 37.79865 ZT4-7 35.4176 35.4176 35.4176 ZT8-11 28.60485 28.60485 28.60485 ZT12-15 22.8209 22.8209 22.8209 ZT16-19 32.692350000000005 32.692350000000005 32.692350000000005 ZT20-23 37.43665 37.43665 37.43665