condition mean min max ZT0-3 1.20055219375 1.0007189425 1.400385445 ZT4-7 0.1916580825 0.137918481 0.245397684 ZT8-11 0.216202476 0.165070218 0.267334734 ZT12-15 0.5764492940000001 0.5045776045 0.6483209835000001 ZT16-19 1.9002972605 1.3788724559999999 2.421722065 ZT20-23 3.34662325825 2.6347620555 4.058484461