condition mean min max ZT0-3 109.362944 109.362944 109.362944 ZT4-7 141.076971 141.076971 141.076971 ZT8-11 195.27312849999998 195.27312849999998 195.27312849999998 ZT12-15 146.7994425 146.7994425 146.7994425 ZT16-19 137.446406 137.446406 137.446406 ZT20-23 151.0221545 151.0221545 151.0221545