condition mean min max ZT0-3 9.918354 9.918354 9.918354 ZT4-7 10.6887975 10.6887975 10.6887975 ZT8-11 9.756912 9.756912 9.756912 ZT12-15 10.125687 10.125687 10.125687 ZT16-19 12.0864565 12.0864565 12.0864565 ZT20-23 9.3925165 9.3925165 9.3925165