condition mean min max ZT0-3 12.50911 12.50911 12.50911 ZT4-7 11.247273 11.247273 11.247273 ZT8-11 11.162896 11.162896 11.162896 ZT12-15 11.476112 11.476112 11.476112 ZT16-19 11.366855000000001 11.366855000000001 11.366855000000001 ZT20-23 12.380599499999999 12.380599499999999 12.380599499999999