condition mean min max ZT0-3 9.277515 9.277515 9.277515 ZT4-7 11.689391 11.689391 11.689391 ZT8-11 10.7544395 10.7544395 10.7544395 ZT12-15 9.520555 9.520555 9.520555 ZT16-19 11.9381085 11.9381085 11.9381085 ZT20-23 10.132784000000001 10.132784000000001 10.132784000000001