condition mean min max ZT0-3 9.66947 9.66947 9.66947 ZT4-7 11.304599 11.304599 11.304599 ZT8-11 11.5690045 11.5690045 11.5690045 ZT12-15 10.970607999999999 10.970607999999999 10.970607999999999 ZT16-19 10.1090175 10.1090175 10.1090175 ZT20-23 11.144564 11.144564 11.144564