Table 2.
Arithmetic means indoor radon concentrations previously reported in upper northern Thailand (UNT).
| Area | Detector | Study design | Indoor Radon (Bq m−3) | References | |
|---|---|---|---|---|---|
| Arithmetic mean (SD), case/control | |||||
| n | Type | ||||
| Saraphi, Chiang Mai | 50 | CR-39 | Survey | 21 (6) | Wanabongse et al.39 |
| Chiang Mai | 33 / 23 | Ionization chamber | Case–Control | 20 (15), 20.1 / 20.2 (p > 0.05) | Boonyaprapa et al.40 |
| Chiang Mai | 35/33 | CR-39 | Case–Control | 57 (7) | Autsavapromporn et al.30 |
| Doi Saket, Chiang Mai | 30 | CR-39 | Survey | 53 (15) | Thumvijit et al.29 |
| Lampang | 786 | Activated charcoal | Survey | 32 (21) | Tansurat et al.41 |
| Thailand | 16 (1.2)g | IAEA28 | |||
| Global | 39 | WHO19 | |||
| Upper northern Thailand | 77 / 78 | CR-39 | Case–Control | 105 (74), 109 / 102 (p = 0.033) | This study |
g = geometric mean.