condition mean min max ZT0-3 10.99748 9.040659999999999 12.9543 ZT4-7 7.11608 7.11608 7.11608 ZT8-11 7.0699749999999995 7.0699749999999995 7.0699749999999995 ZT12-15 0 0 0 ZT16-19 23.767000000000003 23.767000000000003 23.767000000000003 ZT20-23 19.65065 19.65065 19.65065