condition mean min max ZT0-3 0.0293655 0.0 0.058731 ZT4-7 0.0 0.0 0.0 ZT8-11 0.05894485 0.05894485 0.05894485 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.05808635 0.05808635 0.05808635