condition mean min max ZT0-3 10.33015 10.33015 10.33015 ZT4-7 8.267795 8.267795 8.267795 ZT8-11 8.15606 8.15606 8.15606 ZT12-15 8.3923 8.3923 8.3923 ZT16-19 15.0082 15.0082 15.0082 ZT20-23 12.292200000000001 12.292200000000001 12.292200000000001