condition mean min max ZT0-3 31.94076 31.94076 31.94076 ZT4-7 44.452457499999994 44.452457499999994 44.452457499999994 ZT8-11 37.551137 37.551137 37.551137 ZT12-15 34.874911 34.874911 34.874911 ZT16-19 41.389760499999994 41.389760499999994 41.389760499999994 ZT20-23 38.8601125 38.8601125 38.8601125