condition mean min max ZT0-3 0.868596 0.491867 1.245325 ZT4-7 0.61369 0.61369 0.61369 ZT8-11 0.2463235 0.2463235 0.2463235 ZT12-15 0 0 0 ZT16-19 0.8568075 0.8568075 0.8568075 ZT20-23 1.3527885 1.3527885 1.3527885