condition mean min max ZT0-3 477.552205 477.552205 477.552205 ZT4-7 422.99898499999995 422.99898499999995 422.99898499999995 ZT8-11 377.492761 377.492761 377.492761 ZT12-15 422.6120185 422.6120185 422.6120185 ZT16-19 426.85788 426.85788 426.85788 ZT20-23 460.20768799999996 460.20768799999996 460.20768799999996