condition mean min max ZT0-3 1.77529 1.77529 1.77529 ZT4-7 0.952602 0.952602 0.952602 ZT8-11 0.7053105 0.7053105 0.7053105 ZT12-15 0.908041 0.908041 0.908041 ZT16-19 3.3213950000000003 3.3213950000000003 3.3213950000000003 ZT20-23 2.53552 2.53552 2.53552