condition mean min max ZT0-3 1.9113475 1.5420449999999999 2.28065 ZT4-7 1.021451 1.021451 1.021451 ZT8-11 5.14112 5.14112 5.14112 ZT12-15 0 0 0 ZT16-19 3.285415 3.285415 3.285415 ZT20-23 3.80734 3.80734 3.80734