condition mean min max ZT0-3 3.4294225000000003 3.133655 3.72519 ZT4-7 2.058975 2.058975 2.058975 ZT8-11 9.9319 9.9319 9.9319 ZT12-15 0 0 0 ZT16-19 10.81345 10.81345 10.81345 ZT20-23 6.83384 6.83384 6.83384