Table 1.
Characteristics of included studies.
| Study | Years | Country | Ethnicity | Study design | Assay approach | Sample type | Allergen | NOS | Sample number(n) (Male/Female) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| HP | Controls | ||||||||||
| d'Alessandro M | 2020 | Italy | Caucasian | CCS | ELISA | Serum | NA | 7 | 34 (20/14) | 22 (6/16) | |
| d'Alessandro M | 2021 | Italy | Caucasian | CCS | ELISA | Serum | NA | 7 | 14 (8/6) | 12 (5/7) | |
| Ding YJ | 2018 | China | Asian | CCS | CLEIA | Serum | NA | 6 | 37 (21/16) | 35 (20/15) | |
| He XB | 2005 | China | Asian | CCS | NA | Serum | NA | 6 | 16 (9/7) | 20 (10/10) | |
| Janssen R | 2005 | Netherlands | Caucasian | CCS | ELISA | Serum | Birds | 7 | 49 (27/22) | 38 (18/20) | |
| Ji Y2020 | 2020 | UK | Caucasian | CSS | ELISA | Plasma | Birds | 7 | 20 (NA) | 10 (NA) | |
| McSharry CP | 2006 | UK | Caucasian | CSS | ELISA | Serum | Birds | 6 | 55 (NA) | 15 (NA) | |
| Mostafa AI (fHP) | 2021 | Egypt | Caucasian | CCS | ELISA | Serum | NA | 8 | 27 (NA) | 20 (NA) | |
| Mostafa AI (nfHP) | 2021 | Egypt | Caucasian | CCS | ELISA | Serum | NA | 8 | 24 (NA) | 20 (NA) | |
| Mostafa AI (Bird -HP) | 2021 | Egypt | Caucasian | CCS | ELISA | Serum | Birds | 8 | 35 (NA) | 20 (NA) | |
| Nukui Y | 2019 | Japan | Asian | CCS | ELISA | Serum | Birds | 8 | 61 (33/28) | 50 (30/20) | |
| Okamoto T | 2015 | Japan | Asian | CCS | ELISA | Serum | NA | 8 | 92 (44/48) | NA | |
| Ren DH | 2015 | China | Asian | CCS | CLEIA | Serum | NA | 6 | 149 (65/84) | 64 (33/31) | |
| Silvia Sánchez-Díez (fHP and Bird -HP) | 2022 | Spain | Caucasian | CSS | ELISA | Serum | Birds | 8 | 24 (NA) | 67 (30/37) | |
| Silvia Sánchez-Díez (fHP and Fungi-HP) | 2022 | Spain | Caucasian | CSS | ELISA | Serum | Fungi | 8 | 10 (NA) | 67 (30/37) | |
| Silvia Sánchez-Díez (nfHP and Bird-HP) | 2022 | Spain | Caucasian | CSS | ELISA | Serum | Birds | 8 | 8 (NA) | 67 (30/37) | |
| Silvia Sánchez-Díez (nfHP and Fungi-HP) | 2022 | Spain | Caucasian | CSS | ELISA | Serum | Fungi | 8 | 7 (NA) | 67 (30/37) | |
| Takahashi T | 2000 | Japan | Asian | CSS | ELISA | Serum | Thermophilic actinomycetes | 7 | 5 (NA) | 237 (NA) | |
| Tsushima K | 2005 | Japan | Asian | CSS | NA | Serum | Mushroom | 6 | 4 (NA) | 22 (0/22) | |
| Yoshikawa S | 2007 | Japan | Asian | CSS | CLEIA | Serum | Mushroom | 7 | 5 (1/4) | 44 (22/21) | |
CSS, cross sectional study; CCS, case–control study; NA, not applicable; HP, Hypersensitivity pneumonitis; fHP, fibrotic Hypersensitivity pneumonitis; nfHP, non fibrotic Hypersensitivity pneumonitis; AHP, Acute Hypersensitivity pneumonitis; CHP, Chronic hypersensitivity pneumonitis. ELISA, Enzyme linked-immuno-sorbent assay; CLEIA, chemiluminescence immunoassay assay; UK, The United Kingdom; NOS, Newcastle-Ottawa Scale.