condition mean min max ZT0-3 10.919855 10.919855 10.919855 ZT4-7 12.311975499999999 12.311975499999999 12.311975499999999 ZT8-11 12.724861 12.724861 12.724861 ZT12-15 11.594160500000001 11.594160500000001 11.594160500000001 ZT16-19 12.3361875 12.3361875 12.3361875 ZT20-23 13.237769499999999 13.237769499999999 13.237769499999999