condition mean min max ZT0-3 44.006273 44.006273 44.006273 ZT4-7 43.938396 43.938396 43.938396 ZT8-11 42.1534255 42.1534255 42.1534255 ZT12-15 43.321508 43.321508 43.321508 ZT16-19 50.064694 50.064694 50.064694 ZT20-23 50.888603 50.888603 50.888603