| Item | Increases (N, %) | Decreases (N, %) | No Relation (N, %) | Do not know (N, %) |
| Incense and candles | 485 (37.7%) | 65 (5.0%) | 504 (39.1%) | 234 (18.2%) |
| Air fresheners | 454 (35.2%) | 191 (14.8%) | 412 (32.0%) | 231 (17.9%) |
| Gas stove for cooking | 545 (42.3%) | 139 (10.8%) | 293 (22.7%) | 311 (24.1%) |
| Fixed carpets | 555 (43.1%) | 117 (9.1%) | 389 (30.2%) | 227 (17.6%) |
| Paint for walls and furniture | 619 (48.1%) | 83 (6.4%) | 348 (27.0%) | 238 (18.5%) |
| Glue for fixing furniture, carpets, etc. | 687 (53.3%) | 34 (2.6%) | 302 (23.4%) | 265 (20.6%) |
| Plywood | 178 (13.8%) | 103 (8.0%) | 593 (46.0%) | 414 (32.1%) |
| Electrical appliances | 283 (22.0%) | 49 (3.8%) | 772 (59.9%) | 184 (14.3%) |
| Dry cleaning | 245 (19.0%) | 277 (21.5%) | 373 (29.0%) | 393 (30.5%) |
| Reducing humidity | 202(15.7%) | 467 (36.3%) | 257 (20.0%) | 362 (28.1%) |
| Using naphthalene to get rid of molds | 358 (27.8%) | 394 (30.6%) | 140 (10.9%) | 396 (30.6%) |
| Wallpaper | 271 (21.0%) | 148 (11.5%) | 519 (40.3%) | 350 (27.2%) |
| Disinfectants used in swimming pools | 363 (28.2%) | 501 (38.9%) | 186 (14.4%) | 238 (18.5%) |
| Smoking | 1227 (95.3%) | 28 (2.2%) | 20 (1.6%) | 13 (1.0%) |
| Raising pets, birds inside home | 984 (76.4%) | 47 (3.6%) | 171 (13.3%) | 86 (6.7%) |
| Plastic floor tiles | 230 (17.9%) | 253 (19.6%) | 448 (34.8%) | 357 (27.7%) |
| Indoor plants | 127 (9.9%) | 929 (72.1%) | 146 (11.3%) | 86 (6.7%) |
| Air exhaust in kitchens and bathrooms | 56 (4.3%) | 1150 (89.3%) | 65 (5.0%) | 17 (1.3%) |
| Cloth dryer inside the house | 105 (8.2%) | 542 (42.1%) | 432 (33.5%) | 209 (16.2%) |