condition mean min max ZT0-3 282.371136 282.371136 282.371136 ZT4-7 177.3381445 177.3381445 177.3381445 ZT8-11 189.19363750000002 189.19363750000002 189.19363750000002 ZT12-15 220.539749 220.539749 220.539749 ZT16-19 230.31944650000003 230.31944650000003 230.31944650000003 ZT20-23 285.5687745 285.5687745 285.5687745