condition mean min max ZT0-3 0.9322775 0.524195 1.448345 ZT4-7 0.463249 0.463249 0.463249 ZT8-11 0.0 0.0 0.0 ZT12-15 0.16022725 0.0 0.3204545 ZT16-19 0.0 0.0 0.0 ZT20-23 0.67525 0.67525 0.67525