condition mean min max ZT0-3 707.731765 707.731765 707.731765 ZT4-7 751.0234535 751.0234535 751.0234535 ZT8-11 640.1988240000001 640.1988240000001 640.1988240000001 ZT12-15 572.0274139999999 572.0274139999999 572.0274139999999 ZT16-19 299.3556615 299.3556615 299.3556615 ZT20-23 258.152844 258.152844 258.152844