condition mean min max ZT0-3 0.05593435 0.05593435 0.05593435 ZT4-7 0.0338557 0.0338557 0.0338557 ZT8-11 0.05084545 0.05084545 0.05084545 ZT12-15 0.01688105 0.01688105 0.01688105 ZT16-19 0.02957725 0.02957725 0.02957725 ZT20-23 0.0146579 0.0146579 0.0146579