condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0744865 0.0744865 0.0744865 ZT8-11 0.342696 0.342696 0.342696 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0968505 0.0968505 0.0968505