condition mean min max ZT0-3 5.1003475 3.4177 6.782995 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 5.04369 5.04369 5.04369 ZT20-23 6.75436 6.75436 6.75436