condition mean min max ZT0-3 18.26745 18.26745 18.26745 ZT4-7 14.393450000000001 14.393450000000001 14.393450000000001 ZT8-11 15.2371 15.2371 15.2371 ZT12-15 18.01565 18.01565 18.01565 ZT16-19 22.24315 22.24315 22.24315 ZT20-23 18.7931 18.7931 18.7931