condition mean min max ZT0-3 1.00910925 0.9515595000000001 1.066659 ZT4-7 6.544305 6.544305 6.544305 ZT8-11 4.35528 4.35528 4.35528 ZT12-15 0 0 0 ZT16-19 2.939 2.939 2.939 ZT20-23 2.0209215 2.0209215 2.0209215