Regarding performance of students for particular teaching aids, it was found that the order of priority of teaching methods as assessed was Blackboard > PPT > TOHP
and this is in accordance with previously conducted studies.
Notably, retention rates were similar for the HPT , TOHP , and TOHPII  studies while retention was lower for AA women in the TONE  and DPP  trials.
For example, in the multisite TONE , WLM , and DPP  trials, enrolling a mixed race/ethnicity and gender sample, inclusion of cultural adaptations resulted in superior weight outcomes compared to HPT , TOHP , and TOHP II  trials.
Because TOHP made sure that its results were not due to age, race, sex, or other factors.
"The original TOHP analysis likely had more statistical power to see a reduced risk because it took those important factors into account," explains Jason Wu, a research associate at the Harvard School of Public Health.
Some previous studies have found that students preferred PPT, while in others the students preferred traditional blackboard teaching to TOHP
1: Lecture delivery Method Chalkboard 10 PPT 3.3 TOHP
3.3 Chalkboard+PPT 83.4 Note: Table made from bar graph.
In fact, most researchers don't even consider small, short-term studies now that there are large, long-term ones like the Trials of Hypertension Prevention (TOHP
), which studied 2,000 people with normal blood pressure for roughly three years.(5)