condition mean min max ZT0-3 4.367925 4.316245 4.419605 ZT4-7 5.77461 5.77461 5.77461 ZT8-11 4.357185 4.357185 4.357185 ZT12-15 0 0 0 ZT16-19 4.3960099999999995 4.3960099999999995 4.3960099999999995 ZT20-23 4.18621 4.18621 4.18621