condition mean min max ZT0-3 0.2528405 0.17066900000000002 0.335012 ZT4-7 0.594046 0.594046 0.594046 ZT8-11 1.27744 1.27744 1.27744 ZT12-15 0 0 0 ZT16-19 1.510535 1.510535 1.510535 ZT20-23 0.3365835 0.3365835 0.3365835