condition mean min max ZT0-3 11.887839 11.887839 11.887839 ZT4-7 10.535287499999999 10.535287499999999 10.535287499999999 ZT8-11 9.6789165 9.6789165 9.6789165 ZT12-15 10.566393999999999 10.566393999999999 10.566393999999999 ZT16-19 9.84916 9.84916 9.84916 ZT20-23 10.3296595 10.3296595 10.3296595