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The incidence of TSH in different studies worldwide.
| Study (Ref) | Year | Country | TSH/Total LC | TSH% |
|---|---|---|---|---|
| Voyles6 | 1991 | USA | 1/500 | 0.20% |
| Larson20 | 1992 | USA | 3/1983 | 0.15% |
| Baird21 | 1992 | USA | 1/800 | 0.13 |
| Azurin9 | 1995 | USA | 10/1300 | 0.77% |
| Ahmad22 | 1997 | USA | 11/1300 | 0.84% |
| Nassar23 | 1997 | UK | 16/870 | 1.83% |
| Sanz-Lopez24 | 1999 | Spain | 2/123 | 1.62% |
| Al-Haijar12 | 2002 | Romania | 10/1453 | 0.68% |
| Uslu10 | 2007 | Turkey | 40/766 | 5.2% |
| Comajuncosas7 | 2014 | Spain | 57/220 | 25.9% |
| Chatzimavroudis11 | 2017 | Greece | 11/1127 | 0.94% |
