condition mean min max ZT0-3 36.271275 32.45655 40.086 ZT4-7 26.9728 26.9728 26.9728 ZT8-11 28.528100000000002 28.528100000000002 28.528100000000002 ZT12-15 0 0 0 ZT16-19 37.0789 37.0789 37.0789 ZT20-23 33.34095 33.34095 33.34095