condition mean min max ZT0-3 5.221496666666667 5.221496666666667 5.221496666666667 ZT4-7 4.939970000000001 4.939970000000001 4.939970000000001 ZT8-11 5.308825000000001 5.308825000000001 5.308825000000001 ZT12-15 5.20459 5.20459 5.20459 ZT16-19 6.73942 6.73942 6.73942 ZT20-23 5.34609 5.34609 5.34609