condition mean min max ZT0-3 0.17911401666666668 0.13411105 0.21077300000000002 ZT4-7 0.1442674 0.1442674 0.1442674 ZT8-11 0.2062965 0.2062965 0.2062965 ZT12-15 0.423397 0.388455 0.458339 ZT16-19 0.3524265 0.3524265 0.3524265 ZT20-23 0.5020614999999999 0.5020614999999999 0.5020614999999999