condition mean min max ZT0-3 1.6234677499999999 1.1872004999999999 2.059735 ZT4-7 1.8557700000000001 1.8557700000000001 1.8557700000000001 ZT8-11 1.162905 1.162905 1.162905 ZT12-15 0 0 0 ZT16-19 1.53734 1.53734 1.53734 ZT20-23 1.831425 1.831425 1.831425