condition mean min max ZT0-3 0.1510305 0.058807250000000005 0.259984 ZT4-7 0.2122615 0.2122615 0.2122615 ZT8-11 0.218909 0.218909 0.218909 ZT12-15 0.78716575 0.709327 0.8650045 ZT16-19 0.30713250000000003 0.30713250000000003 0.30713250000000003 ZT20-23 0.12571074999999998 0.12571074999999998 0.12571074999999998