condition mean min max ZT0-3 0.034776 0.034776 0.034776 ZT4-7 0.0231176 0.0231176 0.0231176 ZT8-11 0.0981542 0.0981542 0.0981542 ZT12-15 0.0119566 0.0119566 0.0119566 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0