condition mean min max ZT0-3 4.48305 3.9497400000000003 5.01636 ZT4-7 4.33362 4.33362 4.33362 ZT8-11 3.764215 3.764215 3.764215 ZT12-15 0 0 0 ZT16-19 5.1316749999999995 5.1316749999999995 5.1316749999999995 ZT20-23 4.796995 4.796995 4.796995