condition mean min max ZT0-3 10.087084 10.087084 10.087084 ZT4-7 10.374319499999999 10.374319499999999 10.374319499999999 ZT8-11 11.123573 11.123573 11.123573 ZT12-15 9.2942875 9.2942875 9.2942875 ZT16-19 8.974463 8.974463 8.974463 ZT20-23 9.116211 9.116211 9.116211