condition mean min max ZT0-3 4.13954 3.419495 4.859585 ZT4-7 4.76952 4.76952 4.76952 ZT8-11 4.400705 4.400705 4.400705 ZT12-15 0 0 0 ZT16-19 6.44675 6.44675 6.44675 ZT20-23 5.765495 5.765495 5.765495