Table 1. The sample size of each selected village.
| Province | District | Commune | Village | Total sample collected |
|---|---|---|---|---|
| Kampot | Banteay Meas (BM) | Tuk Meas Khang Lech | Tuk Meas Khang Lech | 30 |
| Dang Tong (DT.) | Srae Chea Khang Tboung | Tropeang Sda | 30 | |
| Kampong Trach (KT) | Damnak Kantuot Khang Cheung | Phnom Domrey | 30 | |
| Kandal | Kien Svay (KS) | Dei Edth | Dei Edth | 30 |
| Mukh Kampul (MK.) | Svay Ampear | Thmey | 30 | |
| Ponhea Lueu (PL.) | Kampong Os | Kampong Os | 7 | |
| Ta Proun | 23 | |||
| Phnom Penh | Ruessei Kaev (RK) | Chrouy Changvar | Chrouy Changvar | 30 |
| Sen Sok (SS) | Preak Pnov | Preak Pnov | 30 | |
| Pou Senchey (PSc) | Trapeang Krasang | Chaom Chau | 30 | |
| Prey Veng | Bar Phnum (BP) | Cheung Phnum | Svay Samsib | 30 |
| Peam Chor (PC) | Svay Pluoh | Sammaki | 30 | |
| Preah Sdach (PS.) | Lvea | Kongpong Thnoul | 30 | |
| Takeo | Angkor Borei (AB.) | Preaek Phtoul | Angkor Borei | 30 |
| Borei Cholsar (BC) | Borei Cholsar | Kampong Ompil | 30 | |
| Tram Kak (TK) | Cheang Tong | Ang Riem | 30 | |
| Tboung Khmum | Krong Suong (Ksu) | Sangkat Suong | Vihea Loung | 29 |
| Ou Reang Ov (ORO) | Preah Theat | Phum 44 | 30 | |
| Tboung Khmum (TKh) | Chirou Ti Muy | Chirou Ti Muy | 31 | |
| Total | 540 | |||