| Study | Reason for exclusion |
|---|---|
| Aggarwal 1997 | Not common cold |
| Azuma 2010 | Not common cold |
| Azuma 2011 | Not common cold |
| Bachert 2005 | Febrile URTI |
| Banchini 1993 | Not common cold |
| Batista 1985 | Not common cold |
| Bellussi 1993 | Not common cold |
| Bellussi 1996 | Not common cold |
| Benrimoj 2001 | Not common cold |
| Bernstein 1974 | Not common cold |
| Blagden 2002 | Not common cold |
| Bonifaci 1977 | Not common cold |
| Cappella 1993 | Not common cold |
| Chachtel 2011 | Not common cold |
| Ebel 1985 | Not common cold |
| Eccles 2003 | Not common cold |
| Fujimori 1982 | Not randomised |
| Fujimori 1983 | Not common cold |
| Gehanno 2003 | Not common cold |
| Gruber 1977 | Not common cold |
| Kandoth 1984 | Not common cold |
| Katsu 1977 | Not common cold |
| Katsu 1978 | Not common cold |
| Katsu 1982 | Randomisation is not clear |
| Katsu 1983 | Not common cold |
| Kierszenbaum 1991 | Not common cold |
| Lopes 1991 | Not common cold |
| Martinez Gallardo 1994 | Randomisation is not clear |
| Matsumoto 1984 | Not common cold |
| Moore 2002 | Not common cold |
| Nagaoka 1985 | Not common cold |
| Nagaoka 1986a | Not common cold |
| Nagaoka 1986b | Not common cold |
| Nouri 1984 | Not common cold |
| Nouri 1993 | Not common cold |
| Pagella 2001 | Not common cold |
| Passali 1989 | Not common cold |
| Passali 1997 | Not common cold |
| Reiner 1983 | Not common cold |
| Ruperto 2011 | Not common cold |
| Russo 2013 | Not common cold |
| Salmon 1993 | Not common cold |
| Salzberg 1993 | Not common cold |
| Sanchez 1999 | Not common cold |
| Schachtel 1993 | Not common cold |
| Schachtel 2002 | Not common cold |
| Stanley 1975 | Randomisation is not clear |
| Tamura 1984 | Not common cold |
| Ulukol 1999 | Not common cold |
| Vauzelle 1996 | Not common cold |
| Watson 2000 | Not common cold |
URTI: upper respiratory tract infection