Oct 9 (Reuters) - Slovak industrial output rose by a real 13.7 percent year-on-year in August, up from 8.3 percent growth in July, the Slovak Statistics Office said on Monday. INDUSTRIAL OUTPUT Aug/06 July/06 Aug/05 pct change yr/yr 13.7 8.3 4.4 NOTE. Analysts surveyed by Reuters had expected industrial output to have risen by 9.5 percent on an annual basis in August <SK/ECON04> <SK/ECON09>. The data are adjusted for the impact of number of working days. (Reporting by Martin Santa in Bratislava) ((For past economic data and analysts' forecasts, double click on <SK/ECON01>)) ((Editing by Alan Crosby; bratislava.newsroom@reuters.com; Reuters Messaging: martin.santa.reuters.com@reuters.net; +421 2 5341 8402)) Keywords: ECONOMY SLOVAKIA OUTPUT