condition mean min max ZT0-3 8.66532 8.60634 8.7243 ZT4-7 7.73381 7.73381 7.73381 ZT8-11 8.904195000000001 8.904195000000001 8.904195000000001 ZT12-15 0 0 0 ZT16-19 9.354379999999999 9.354379999999999 9.354379999999999 ZT20-23 10.794664999999998 10.794664999999998 10.794664999999998