condition mean min max ZT0-3 31.86975 30.2395 34.86855 ZT4-7 27.116500000000002 27.116500000000002 27.116500000000002 ZT8-11 30.7833 30.7833 30.7833 ZT12-15 31.873325 30.193800000000003 33.55285 ZT16-19 30.107550000000003 30.107550000000003 30.107550000000003 ZT20-23 26.14495 26.14495 26.14495