condition mean min max ZT0-3 7.0018475 6.736375000000001 7.26732 ZT4-7 4.7035149999999994 4.7035149999999994 4.7035149999999994 ZT8-11 4.71342 4.71342 4.71342 ZT12-15 0 0 0 ZT16-19 6.28409 6.28409 6.28409 ZT20-23 6.342245 6.342245 6.342245