condition mean min max ZT0-3 0.3465491666666667 0.253147 0.408187 ZT4-7 0.491823 0.491823 0.491823 ZT8-11 0.298387 0.298387 0.298387 ZT12-15 0.5141374999999999 0.365274 0.663001 ZT16-19 0.6032204999999999 0.6032204999999999 0.6032204999999999 ZT20-23 0.396613 0.396613 0.396613