condition mean min max ZT0-3 151.257216 151.257216 151.257216 ZT4-7 238.034604 238.034604 238.034604 ZT8-11 735.1163255 735.1163255 735.1163255 ZT12-15 590.112639 590.112639 590.112639 ZT16-19 799.9216739999999 799.9216739999999 799.9216739999999 ZT20-23 318.2401905 318.2401905 318.2401905