condition mean min max ZT0-3 0.04433525 0.0 0.0886705 ZT4-7 0.04509395 0.04509395 0.04509395 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.08754135 0.08754135 0.08754135