condition mean min max ZT0-3 0.0170494 0.0170494 0.0170494 ZT4-7 0.01982365 0.01982365 0.01982365 ZT8-11 0.0216785 0.0216785 0.0216785 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.043142200000000006 0.043142200000000006 0.043142200000000006