condition mean min max ZT0-3 56.05335 56.05335 56.05335 ZT4-7 79.11615 79.11615 79.11615 ZT8-11 37.275999999999996 37.275999999999996 37.275999999999996 ZT12-15 48.89825 48.89825 48.89825 ZT16-19 39.81615 39.81615 39.81615 ZT20-23 40.8691 40.8691 40.8691