| Author (year) |
Study setting |
Country |
Sample size |
Study design/statistical analysis |
Outcomes related to age |
References |
| Adams et al. (2004) |
Department of Gastroenterology and Hepatology, Royal Perth Hospital |
Australia |
2157 |
Observational study (retrospective audit)/T-test |
Non-attendance was significant among younger patients (p < 0.001) |
[26] |
| Akinniyi & Olamide (2017) |
Diabetic outpatients’ clinic, the University College Hospital |
Nigeria |
500 |
Observational study (cross-sectional)/chi-square test |
Non-attendance was significantly associated with age (hypertension, p = 0.021; diabetes, p = 0.024) |
[24] |
| Alhamad (2013) |
General Clinic, Military Hospital |
Saudi Arabia |
760 |
Observational study (cross-sectional)/chi-square test |
Non-attendance was significantly associated with young patients (age group = 0-20, p = 0.001) |
[1] |
| Blæhr et al. (2016) |
Department of Radiology in Silkeborg Regional Hospital and the Department of Orthopaedic Surgery in Viborg Regional Hospital |
Denmark |
86524 |
Observational study (cross-sectional) from June 2013 to March 2015/logistic regression analysis |
Non-attendance was significantly associated with young patients (p < 0.01) |
[22] |
| Bofill et al. (2011) |
Immunology Clinic, Jackson Memorial Hospital |
The United States of America |
189 |
Observational study (cross-sectional)/multiple linear regression analysis |
Non-attendance was significantly associated with young patients (p < 0.014) |
[16] |
| Rogan et al. (2015) |
Pain clinics, Birmingham City Hospital |
The United Kingdom |
3591 |
Observational study (retrospective cohort)/T-test |
Non-attendance was significant among younger patients (p = <0.05) |
[33] |
| Giunta et al. (2013) |
Outpatient clinics, the Italian Hospital of Buenos Aires |
Argentina |
113716 |
Observational study (retrospective cohort)/logistic regression analysis |
Non-attendance was significantly associated with age >65 years (p < 0.001) |
[30] |
| Hamilton et al. (2002) |
Outpatient clinics, Royal Devon and Exeter Hospital |
The United Kingdom |
1972 |
Observational study (prospective cohort)/T-test |
Non-attendance was significant among younger patients (p < 0.001) |
[19] |
| Harvey et al. (2017) |
Radiology Department, Massachusetts General Hospital |
The United States of America |
54652 |
Observational study (retrospective cohort)/logistic regression analysis |
Non-attendance was significantly associated with young patients (p = 0.05) |
[18] |
| Lehmann et al. (2017) |
General internal medicine outpatient clinic, the Geneva University Hospitals |
Switzerland |
1296 |
Observational study (retrospective cohort)/chi-square test |
Non-attendance was significantly associated with young patients (p < 0.0014) |
[31] |
| Low et al. (2016) |
Diabetes Clinic, Khoo Teck Puat Hospital |
Singapore |
13244 |
Observational study (retrospective cohort)/logistic regression analysis |
Non-attendance was significantly associated with young patients (p < 0.001) |
[28] |
| Mander et al. (2018) |
Medical Imaging Department, Toowoomba Hospital |
Australia |
13458 |
Observational study (cross-sectional)/chi-square test and logistic regression analysis |
Non-attendance was not significantly associated with age, except 45-54 years (p < 0.001) |
[27] |
| Mbada et al. (2013) |
Physiotherapy Department, the Obafemi Awolowo University Teaching Hospitals |
Nigeria |
930 |
Observational study (retrospective audit)/chi-square test |
Non-attendance was not significantly associated with the age (p = 0.216) |
[23] |
| Milne et al. (2014) |
Rheumatology outpatient clinics, Hutt Hospital |
New Zealand |
1953 |
Observational study (case-study)/Mann–Whitney non-parametric test |
Non-attendance was significantly associated with young patients (p ≤ 0.001) |
[34] |
| Ooi et al. (2021) |
Radiology Department, Changi General Hospital |
Singapore |
59748 |
Observational study (retrospective audit)/chi-square, T-test, logistic regression analysis |
Non-attendance was significantly associated with young patients (p < 0.001) |
[35] |
| Ootes et al. (2012) |
Orthopaedic Clinic, Massachusetts General Hospital |
The United States of America |
665 |
Observational study (retrospective cohort)/point biserial correlation test |
Non-attendance was not significantly associated with the age |
[17] |
| Pillai et al. (2012) |
Gynecology outpatient clinic, North Middlesex University Hospital |
The United Kingdom |
6900 |
Retrospective study, the second arm a prospective case-control study/T-test |
Non-attendance was significant among younger patients (p = 0.002) |
[32] |
