condition mean min max ZT0-3 0.502903 0.502903 0.502903 ZT4-7 0.47474150000000004 0.47474150000000004 0.47474150000000004 ZT8-11 0.34652550000000004 0.34652550000000004 0.34652550000000004 ZT12-15 0.2649245 0.2649245 0.2649245 ZT16-19 0.524515 0.524515 0.524515 ZT20-23 0.5366124999999999 0.5366124999999999 0.5366124999999999