condition mean min max ZT0-3 2.7812124999999996 2.15141 3.411015 ZT4-7 19.73895 19.73895 19.73895 ZT8-11 5.38723 5.38723 5.38723 ZT12-15 0 0 0 ZT16-19 1.103072 1.103072 1.103072 ZT20-23 3.7324100000000002 3.7324100000000002 3.7324100000000002