condition mean min max ZT0-3 42.288273 42.288273 42.288273 ZT4-7 32.7528345 32.7528345 32.7528345 ZT8-11 25.531476499999997 25.531476499999997 25.531476499999997 ZT12-15 29.663262 29.663262 29.663262 ZT16-19 22.062643 22.062643 22.062643 ZT20-23 24.32087 24.32087 24.32087