condition mean min max ZT0-3 0.9108715000000001 0.9108715000000001 0.9108715000000001 ZT4-7 0.0 0.0 0.0 ZT8-11 0.304288 0.304288 0.304288 ZT12-15 0.4929515 0.4929515 0.4929515 ZT16-19 2.617375 2.617375 2.617375 ZT20-23 3.2326349999999997 3.2326349999999997 3.2326349999999997