condition mean min max ZT0-3 225.20392 225.20392 225.20392 ZT4-7 329.915438 329.915438 329.915438 ZT8-11 400.63214949999997 400.63214949999997 400.63214949999997 ZT12-15 334.4086115 334.4086115 334.4086115 ZT16-19 318.7867455 318.7867455 318.7867455 ZT20-23 309.298954 309.298954 309.298954