condition mean min max ZT0-3 439.542569 439.542569 439.542569 ZT4-7 291.0648705 291.0648705 291.0648705 ZT8-11 303.66328450000003 303.66328450000003 303.66328450000003 ZT12-15 375.5642245 375.5642245 375.5642245 ZT16-19 574.58973 574.58973 574.58973 ZT20-23 594.204244 594.204244 594.204244