condition mean min max ZT0-3 47.3629 47.3629 47.3629 ZT4-7 51.32465 51.32465 51.32465 ZT8-11 42.3617 42.3617 42.3617 ZT12-15 31.4769 31.4769 31.4769 ZT16-19 28.2723 28.2723 28.2723 ZT20-23 28.4062 28.4062 28.4062