condition mean min max ZT0-3 403.669772 403.669772 403.669772 ZT4-7 477.2841085 477.2841085 477.2841085 ZT8-11 530.3934925000001 530.3934925000001 530.3934925000001 ZT12-15 492.0030155 492.0030155 492.0030155 ZT16-19 394.50931549999996 394.50931549999996 394.50931549999996 ZT20-23 402.026705 402.026705 402.026705