condition mean min max ZT0-3 39.4319527925 27.62860455 51.235301035000006 ZT4-7 52.04550247 48.011994560000005 56.07901038 ZT8-11 49.346966502499995 42.06952229 56.624410714999996 ZT12-15 52.101560445 48.673302344999996 55.529818545 ZT16-19 54.277349029999996 53.424643225 55.130054834999996 ZT20-23 56.264225052499995 52.501276135 60.02717397