| [71] | United States (US) | 343 Pregnant patients | Questionnaires | Descriptive statistics and the paired t test |
| [53] | Canada | 69 Military personnel presenting for on-site chiropractic services | Questionnaire | Multivariable regression model |
| [34] | US | 20 Patients with low back pain | Questionnaires | Student's t-test |
| [44] | Canada | 6 Chiropractors licensed with the College of Chiropractors of British Columbia | Questionnaire | Descriptive statistics |
| [72] | US | 20 Institutions provided a written copy of the Informed consent documents | Retrieving Informed Consent (IC) documents | IC were compared against a list of requirements |
| [73] | United Kingdom (UK) | 509 Participants from four participating UK associations | Telephone survey | Pearson Chi-Square tests |
| [74] | Australia | 153 Patients with chronic conditions | Questionnaires | Descriptive and summary statistics |
| [75] | US | 1759 Adults in the United States population | Questionnaire | Descriptive and multivariate methods |
| [76] | US | 66 Questionnaires were returned from new and established patients | Questionnaire | Not explicitly specified |
| [54] | US | 400 Participants with chronic low back pain | Questionnaire | Path analysis |
| [77] | US | 681 Patients randomized, 341 were assigned to the 2 chiropractic groups | Questionnaires at baseline and 2 weeks of treatment | Mixed linear modelling |
| [55] | US | Same trial as in the study of Hertzman-Miller et al. [77] | Questionnaires | Multiple logistic and linear regression modelling |
| [35] | Australia | 144 Patients seeing chiropractors with practices in diverse locations | Questionnaires | Not explicitly specified |
| [36] | Australia | 9 Chiropractors and 173 patients participated | Questionnaires | Descriptive statistics |
| [49] | The Netherlands | 89 Chiropractors, 207 patient–chiropractor working relationships | Questionnaires | A one-way ANOVA (analysis of variance) test |
| [78] | US | 72 Chiropractors who worked in 61 chiropractic practices | Questionnaire | Regression analysis |
| [55] | Canada | 2597 Patients participating in a collaborative study | Questionnaires | A multiple linear regression model |
| [38] | US | A sample of 57 people, who made a total of 104 office visits between them | (1) Audiotape of all clinical interaction of the chiropractor for 8 days (2) patient questionnaires pertaining to satisfaction with care | (1) Data was content analysed using the modified Bales method of process analysis [69]. (2) descriptive statistics |
| [79] | UK | 465 Practitioners of which 132 chiropractors (28%) | Questionnaires | Several multivariate analyses of variance (ANOVA) |
| [52] | US | 541 New and returning chiropractic patients | Questionnaires | Multiple stepwise regression analysis |
| [80] | Sweden | 30 Chiropractors and 336 patients from 17 private practices | Questionnaires | The Wilcoxon signed rank test |
| [81] | US | 62 Chronic pain patients recruited from four chiropractic offices | Questionnaires | Series of multiple regression analyses |
| [41] | Canada | 90 Participants were recruited from two private chiropractic clinics | Questionnaire | Descriptive statistics |