condition mean min max ZT0-3 4.26266 3.57543 4.94989 ZT4-7 3.9508900000000002 3.9508900000000002 3.9508900000000002 ZT8-11 4.3378250000000005 4.3378250000000005 4.3378250000000005 ZT12-15 0 0 0 ZT16-19 4.4940549999999995 4.4940549999999995 4.4940549999999995 ZT20-23 4.29776 4.29776 4.29776