Background. Recent research has shown that the Fitkids Treadmill Test (FTT) is a valid and reproducible exercise test for the assessment of aerobic exercise capacity in children and adolescents who are healthy. Objective. The study objective was to provide sex- and age-related normative values for FTT performance in children and adolescents who were healthy, developing typically, and 6 to 18 years of age. Design. This was a cross-sectional, observational study. Methods. Three hundred fifty-six children and adolescents who were healthy (174 boys and 182 girls; mean age12.9 years, SD3.7) performed the FTT to their maximal effort to assess time to exhaustion (TTE). The least-mean-square method was used to generate sex- and age-related centile charts (P3, P10, P25, P50, P75, P90, and P97) for TTE on the FTT. Results. In boys, the reference curve (P50) showed an almost linear increase in TTE with age, from 8.8 minutes at 6 years of age to 16.1 minutes at 18 years of age. In girls, the P50 values for TTE increased from 8.8 minutes at 6 years of age to 12.5 minutes at 18 years of age, with a plateau in TTE starting at approximately 10 years of age. Limitations. Youth who were not white were underrepresented in this study. Conclusions. This study describes sex- and age-related normative values for FTT performance in children and adolescents who were healthy, developing typically, and 6 to 18 years of age. These age- and sex-related normative values will increase the usefulness of the FTT in clinical practice.
Values, representing higher abstract goals in life, receive increasing attention in branding literature and practice. However, understanding of how values drive consumer behavior is limited. This research contributes to a better understanding of the importance of values and value types in marketing communications and how they can influence consumer behaviour. This is particularly relevant given the recent rise in values-based marketing, sometimes also referred to as purpose marketing. Three studies were conducted. The outcomes of study one showed that perceived values (rather than personality traits) indeed play a key role, alongside functional congruence, as a predictor of repurchase intentions. This was particularly true for consumer durables and service brands that consumers have longer relationships with. Study two confirmed that perceived brand values are, next to functional product characteristics, considered as more important than brand personality traits when longer relationships are involved. These effects were most pronounced in the case of prospective situations and services compared to products. Having demonstrated the importance of brand values, the third study zoomed in on the type of value communicated. To this end, brand messages involving self-transcending values (such as concern for society, the environment, and close others) were compared with self-enhancement values (mainly the personal need for recognition of achievements by others and power). In line with research on purpose marketing, results showed that brand messages with self-transcending values outperformed those with self-enhancement values on measures including attitudes toward the brand, perceived quality, and consideration to buy. Moreover, consumer brand identification acted as a mediator in this process, further reinforcing the aforementioned effects. The final chapter of this dissertation presents a discussion of the findings presented across the studies, including relevance to practice and directions for follow-up research. Findings across these studies show that brand values are key to consumer decision making and hence deserve more attention in marketing and branding literature.
INTRODUCTION: In the Netherlands, hospitals have difficulty in implementing the formal procedure of comparing radiation dose values to Diagnostic Reference Levels (DRLs).METHODS: To support the hospitals, train radiography students, and carry out a nationwide dose survey, diagnostic radiography students performed 125 DRL comparisons for nine different procedures in 29 radiology departments. Students were instructed at three Dutch Universities of Applied Sciences with a radiography programme and supervised by medical physicists from the participating hospitals.RESULTS: After a pilot study in the western part of the country in eight hospitals, this study was enlarged to involve 21 hospitals from all over the Netherlands. The 86 obtained dose comparisons fall below the DRLs in 97% of all cases. This very high compliance may have been enhanced by the voluntary participation of hospitals that are confident about their performance.CONCLUSION: The results indicate that the current DRLs that were not based on a national survey, may need to be updated, sometimes to half their current value. For chest and pelvis examinations the DRLs could be lowered from 12 and 300 μGy·m 2 to the 75-percentile values found in this study of 5,9 and 188 μGy·m 2, respectively.
Although cardiorespiratory fitness (CRF) is being recognized as an important marker of health and functioning, it is currently not routinely assessed in daily clinical practice. There is an urgent need for a simple and feasible exercise test that can validly and reliably estimate an individual’s CRF. The Steep Ramp Test (SRT) is such a practical short-time exercise test (work rate increments of 25 W/10 seconds, so the test phase will only take up to 4 minutes) on a cycle ergometer, that does not require expensive equipment or specialized knowledge, and has been found able to validly and reliably estimate an individual’s CRF. Although the SRT is already frequently used in the Netherlands to evaluate CRF, sex- and age-specific reference values for adults and elderly are lacking thus far, which seriously limits the interpretation of test results.
