condition mean min max ZT0-3 2.529926 2.529926 2.529926 ZT4-7 0.6750725 0.6750725 0.6750725 ZT8-11 1.83103 1.83103 1.83103 ZT12-15 0.6212485000000001 0.6212485000000001 0.6212485000000001 ZT16-19 0.7132253333333334 0.7132253333333334 0.7132253333333334 ZT20-23 1.7300630000000001 1.7300630000000001 1.7300630000000001