condition mean min max ZT0-3 21.63181 21.63181 21.63181 ZT4-7 48.325675 48.325675 48.325675 ZT8-11 68.5468275 68.5468275 68.5468275 ZT12-15 43.979767 43.979767 43.979767 ZT16-19 20.778885000000002 20.778885000000002 20.778885000000002 ZT20-23 16.638548 16.638548 16.638548