condition mean min max ZT0-3 366.555438 366.555438 366.555438 ZT4-7 304.55724200000003 304.55724200000003 304.55724200000003 ZT8-11 359.5046515 359.5046515 359.5046515 ZT12-15 411.6578265 411.6578265 411.6578265 ZT16-19 283.9108935 283.9108935 283.9108935 ZT20-23 235.0012875 235.0012875 235.0012875