condition mean min max ZT0-3 18.760592925 13.23592569 24.28526016 ZT4-7 97.388390235 73.25273217 121.5240483 ZT8-11 267.441414175 210.740766 324.14206235 ZT12-15 472.21239802499997 457.1408593 487.28393675 ZT16-19 304.719832275 290.49754244999997 318.9421221 ZT20-23 258.3937997 255.7501567 261.0374427