condition mean min max ZT0-3 0.21506658333333334 0.14882700000000001 0.275512 ZT4-7 0.4834145 0.4834145 0.4834145 ZT8-11 0.8802034999999999 0.8802034999999999 0.8802034999999999 ZT12-15 0.77071275 0.764417 0.7770085 ZT16-19 0.6299159999999999 0.6299159999999999 0.6299159999999999 ZT20-23 0.440147 0.440147 0.440147