public String countTepStatisticPerAge()
				{
					String tepPerAge="";
					  try {
					    Class.forName(driverClassName);
					    Connection con = DriverManager.getConnection (url,user,passwd);
					    Statement stmt = con.createStatement();
						String sql= "SELECT AVG(hlikia) FROM history WHERE clinic = 'TEP' LIMIT 20";
						ResultSet rs = stmt.executeQuery(sql);
						tepPerAge=rs.toString();	
					}
					catch (SQLException e) {
							    e.printStackTrace();
					}
					catch (Exception e) {
							    e.printStackTrace();
				}
					  return tepPerAge;
				}