Huddersfield have been promoted to the Premier League after beating Reading on penalties in the Championship play-off final.Attention will now turn to survival in the top flight for David Wagner and co - with the record of previous play-off winners providing mixed messages as to their hopes. :: In 15 of the 25 Premier League seasons to date, the team promoted via the play-offs has been relegated - meaning 10, or 40 per cent, have survived. :: However, the average finishing position the season after winning the play-offs is 16th (15.92, or 15.95 in the years since the Premier League was reduced to 20 teams).:: That is thanks to five teams finishing in the top half - Blackburn were fourth in 1992-93, the first season of the Premier League, Leicester ninth in 1996-97, Ipswich fifth in 2000-01 and West Ham ninth in 2005-06 and 10th in 2012-13.:: The last team to survive after winning the play-offs were Crystal Palace in 2013-14. Since then, QPR, Norwich and Hull have each lasted just one season.:: Birmingham, the last team to win promotion via a penalty shoot-out, survived and finished 13th in the following top-flight season in 2002-03. Charlton, though, were relegated in 1998-99 after going up in similar fashion. :: Three other finals went to extra time, with Palace (2013-14) and Leicester (1996-97) surviving but Bolton relegated in 1995-96.:: Huddersfield finished the regular season in fifth place, the third of the four play-off spots. Three of the seven teams previously promoted from that third play-off slot have survived - the aforementioned Palace, Birmingham and Leicester teams - with the other four relegated. :: Town are the first team ever promoted to the Premier League with a negative goal difference.