condition mean min max ZT0-3 85.458257 85.458257 85.458257 ZT4-7 55.171838 55.171838 55.171838 ZT8-11 50.2898535 50.2898535 50.2898535 ZT12-15 62.9689405 62.9689405 62.9689405 ZT16-19 53.647746999999995 53.647746999999995 53.647746999999995 ZT20-23 55.4220325 55.4220325 55.4220325