condition mean min max ZT0-3 14.37665 14.37665 14.37665 ZT4-7 10.229261 10.229261 10.229261 ZT8-11 11.948519999999998 11.948519999999998 11.948519999999998 ZT12-15 9.73884 9.73884 9.73884 ZT16-19 11.761594500000001 11.761594500000001 11.761594500000001 ZT20-23 12.091002 12.091002 12.091002