condition mean min max ZT0-3 78.617571 78.617571 78.617571 ZT4-7 70.4728565 70.4728565 70.4728565 ZT8-11 74.62120150000001 74.62120150000001 74.62120150000001 ZT12-15 67.805822 67.805822 67.805822 ZT16-19 85.2627195 85.2627195 85.2627195 ZT20-23 88.6343425 88.6343425 88.6343425