condition mean min max ZT0-3 0.3635355 0.2494565 0.45006650000000004 ZT4-7 0.0610225 0.0610225 0.0610225 ZT8-11 0.2564335 0.2564335 0.2564335 ZT12-15 0.33336875 0.203455 0.4632825 ZT16-19 0.6740120000000001 0.6740120000000001 0.6740120000000001 ZT20-23 0.2775875 0.2775875 0.2775875