condition mean min max ZT0-3 10.984 10.984 10.984 ZT4-7 9.298535000000001 9.298535000000001 9.298535000000001 ZT8-11 8.132945 8.132945 8.132945 ZT12-15 7.8271250000000006 7.8271250000000006 7.8271250000000006 ZT16-19 9.464604999999999 9.464604999999999 9.464604999999999 ZT20-23 10.238935 10.238935 10.238935