condition mean min max ZT0-3 12.454899 12.454899 12.454899 ZT4-7 12.9063155 12.9063155 12.9063155 ZT8-11 15.074265 15.074265 15.074265 ZT12-15 16.401799 16.401799 16.401799 ZT16-19 14.2505785 14.2505785 14.2505785 ZT20-23 12.823273 12.823273 12.823273