condition mean min max ZT0-3 130.001288 130.001288 130.001288 ZT4-7 209.14852100000002 209.14852100000002 209.14852100000002 ZT8-11 243.3576695 243.3576695 243.3576695 ZT12-15 203.79153050000002 203.79153050000002 203.79153050000002 ZT16-19 191.54002100000002 191.54002100000002 191.54002100000002 ZT20-23 196.3905595 196.3905595 196.3905595