condition mean min max ZT0-3 26.92455 23.24185 30.60725 ZT4-7 31.853 31.853 31.853 ZT8-11 22.6836 22.6836 22.6836 ZT12-15 0 0 0 ZT16-19 43.2636 43.2636 43.2636 ZT20-23 32.37665 32.37665 32.37665