condition mean min max ZT0-3 10.848567 10.848567 10.848567 ZT4-7 11.4642375 11.4642375 11.4642375 ZT8-11 9.2900635 9.2900635 9.2900635 ZT12-15 12.001858 12.001858 12.001858 ZT16-19 11.495615 11.495615 11.495615 ZT20-23 12.0285195 12.0285195 12.0285195