condition mean min max ZT0-3 1.498605 1.498605 1.498605 ZT4-7 0.23124299999999998 0.23124299999999998 0.23124299999999998 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0501935 0.0501935 0.0501935 ZT20-23 1.104093 1.104093 1.104093