condition mean min max ZT0-3 16.523099 16.523099 16.523099 ZT4-7 15.653326 15.653326 15.653326 ZT8-11 16.9584595 16.9584595 16.9584595 ZT12-15 15.1454735 15.1454735 15.1454735 ZT16-19 17.9377145 17.9377145 17.9377145 ZT20-23 15.0342895 15.0342895 15.0342895