condition mean min max ZT0-3 83.831575 81.87795 85.7852 ZT4-7 45.984 45.984 45.984 ZT8-11 19.36465 19.36465 19.36465 ZT12-15 0 0 0 ZT16-19 73.04124999999999 73.04124999999999 73.04124999999999 ZT20-23 50.3103 50.3103 50.3103