A growing number of national diagnostic reference levels based on clinical indications (NDRL_ci) in CT have been implemented worldwide since the International Commission on Radiological Protection’s 2017 recommendation. This study aims to compare NDRL_ci practices, identify influencing factors and propose evidence-based recommendations for NDRL_ci development, based on the literature published between 1996 and 2025.

Systematic review.

A systematic literature search was conducted in PubMed, Web of Science and Scopus from 1996 to 24 august 2025. The Preferred Reporting Items for Systematic Reviews and Meta-Analysis framework was followed to report the study selection process in this review. Joanna Briggs Institute’s critical appraisal tools were used to evaluate the articles critically.

Adult patients undergoing CT scans for various clinical indications.

Clinical indication-based CT protocols with reported NDRL_ci values as CT dose index volume and dose length product (DLP).

The primary outcomes were NDRL_ci values reported for various clinical indications. The secondary outcomes were CT technology, protocol parameters and patient characteristics influencing NDRL_ci.

A total of 4146 articles were identified. 410 full texts were examined and 11 studies were included in the systematic review. 25 clinical indications across seven anatomical regions were identified across 11 included studies. The NDRL_ci for urinary stones and cerebrovascular accident had the highest number of references, while flank pain and occlusion had the lowest number. The highest NDRL_ci in DLP was found for total body CT in severe trauma (3830 mGy cm) and the lowest for sinusitis (70 mGy cm).

Several factors contribute to dose discrepancies for the same clinical indications in CT imaging, including kilovolt peak and milliampere-second, scan length, number of phases, patient size, reconstruction algorithm, CT scanner age and specifications, underscoring the need for standardised and optimised CT protocols. This review highlighted several challenges, which emphasise the importance of international organisations to standardise the development of NDRL_ci to improve comparability across countries.

CRD42024603574.

This study investigates how environmental and household variables relate to groundwater quality in Indonesia.

The research uses data from the 2020 Cross-sectional Household Drinking Water Quality Study, the National Socioeconomic Survey 2020, and climate records.

Indonesia.

The study includes 5965 households across 34 provinces, using descriptive and path analysis techniques.

The microbiological quality of drinking water was primarily focused on Escherichia coli as an indicator of microbial contamination.

Out of 5965 households, only 5.15% had emptied faecal sludge (FS) in the last 3 years, while E. coli contamination was detected in 71.21% of the samples. Improved drinking water sources and proper FS emptying practices were associated with better water quality.

These findings highlight the urgent need for enhanced surveillance and evidence-based policymaking to safeguard both drinking water quality and sanitation practices, which are crucial for public health and environmental sustainability.

To develop, evaluate and validate the musculoskeletal health climate questionnaire (MHCQ), a multidimensional questionnaire for measuring musculoskeletal health climate.

Cross-sectional test–retest study including systematic scale development and psychometric validation.

The questionnaire was developed following the best practice recommendations for scale development outlined by Boateng et al (2017), including item development, scale development and scale evaluation with input from experts, stakeholders and the target population. Validation was conducted among employees in three physically demanding occupations in Denmark (care workers, slaughterhouse workers and residential painters), where a total of 1420 participants were recruited through labour unions. Of these, 796 completed the retest survey 30 days later. Exploratory and confirmatory factor analyses (EFA and CFA, respectively), internal consistency (Cronbach’s α), test–retest reliability (intraclass correlation coefficients (ICC)) and SEM were used to assess the psychometric properties. Criterion validity was examined via associations with pain points, pain medication use and sickness absence. Construct validity was assessed using correlations with the prevent for work questionnaire (P4Wq).

EFA and CFA supported a four-factor model (supervisor’s practices, workplace practices, worker involvement practices and workers’ pain practices) with good to excellent fit (comparative fit index, 0.96–0.99; root mean square error of approximation, 0.04–0.06). All scales showed high internal consistency (α=0.80–0.88) and excellent test–retest reliability (ICC=0.86–0.92). Associations with musculoskeletal outcomes supported criterion validity. Weak to moderate correlations with the P4Wq subscales (rho

The MHCQ provides a validated, multidimensional tool to assess workplace climate related to musculoskeletal health. It can support workplace assessments and prevention efforts by capturing shared perceptions of leadership, support, involvement and pain-related norms. Further longitudinal research and the use of objective outcome data are needed to assess predictive validity and strengthen the instrument’s applicability across settings.

Sickle cell disease (SCD) is associated with significant mortality and morbidity, especially in low- and middle-income countries.

We determined the indications for hospitalisation and predictors of 30-day re-admission among patients with SCD in Northern and Central Uganda.

Retrospective chart review.

Mulago National Referral Hospital in Kampala, St. Mary’s Hospital Lacor in Gulu and Gulu Regional Referral Hospital in Gulu, Uganda.

Patients with confirmed SCD admitted between January 2020 and January 2025 were included.

Primary outcome: indication for hospitalisation. Secondary outcomes: rate and predictors of 30-day hospital re-admission. Socio-demographic, clinical history and hospitalisation data were extracted using a pretested data extraction tool.

We enrolled 505 patients, accounting for 714 hospital admissions, with a mean age of 8.1±6.2 years. Most participants (n=489, 96.8%) had less than four admissions per year, with a median of 1 admission (IQR: 0–2). The most common indications for hospitalisation were infection (n=375, 52.5%), painful crisis (n=366, 51.3%) and anaemia (n=186, 26.1%). Malaria was the most prevalent infection (n=244, 65%). The median length of hospital stay was 4 days (IQR: 3–6), with a 30-day re-admission rate of 6.9% (n=49). Admission with painful crisis (adjusted OR (AOR): 0.45, 95% CI: 0.23 to 0.89, p=0.021), receiving a blood product (AOR: 0.32, 95% CI: 0.16 to 0.66, p=0.002) and having four or more admissions per year (AOR: 0.84, 95% CI: 0.04 to 0.17, p

Infections, especially malaria, and painful crises were the leading causes of hospitalisation among Ugandan patients with SCD. Frequent admissions, painful crises and blood transfusions were associated with lower 30-day re-admission risk. There is an urgent need to strengthen malaria prevention strategies and optimise access to disease-modifying therapy, such as hydroxyurea, to improve patient outcomes.