condition mean min max ZT0-3 10.204961666666668 6.103384999999999 12.312550000000002 ZT4-7 6.222695 6.222695 6.222695 ZT8-11 13.287500000000001 13.287500000000001 13.287500000000001 ZT12-15 15.181975000000001 14.9015 15.46245 ZT16-19 15.92375 15.92375 15.92375 ZT20-23 15.1038 15.1038 15.1038