condition mean min max ZT0-3 10.075848 10.075848 10.075848 ZT4-7 11.548525000000001 11.548525000000001 11.548525000000001 ZT8-11 12.440401 12.440401 12.440401 ZT12-15 11.0705885 11.0705885 11.0705885 ZT16-19 11.0786805 11.0786805 11.0786805 ZT20-23 11.29453 11.29453 11.29453