condition mean min max ZT0-3 0.19924833333333333 0.0 0.597745 ZT4-7 0.0 0.0 0.0 ZT8-11 0.535935 0.535935 0.535935 ZT12-15 0.2858225 0.0 0.571645 ZT16-19 0.4089975 0.4089975 0.4089975 ZT20-23 1.15308 1.15308 1.15308