condition mean min max ZT0-3 0.7022431666666668 0.6307985 0.797849 ZT4-7 0.480476 0.480476 0.480476 ZT8-11 0.42013349999999994 0.42013349999999994 0.42013349999999994 ZT12-15 1.4432800000000001 1.305955 1.580605 ZT16-19 1.050246 1.050246 1.050246 ZT20-23 1.1691585 1.1691585 1.1691585