condition mean min max ZT0-3 0.521625 0.521625 0.521625 ZT4-7 0.449853 0.449853 0.449853 ZT8-11 0.20009900000000003 0.20009900000000003 0.20009900000000003 ZT12-15 0.48564 0.48564 0.48564 ZT16-19 0.4295295 0.4295295 0.4295295 ZT20-23 0.567319 0.567319 0.567319