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Two of the included studies used very similar populations based on a surveillance program with data collection over the same period of time [ 48, 55]; however, both were included in the analyses as they contributed to different subgroup categories, therefore there was insufficient evidence to ascertain whether they were mutually exclusive.
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Nevertheless, our study has several strengths including a vigorous quality assurance program and the same strict methodology used to ensure the quality of the data collection over the entire study period.
Our study has several strengths including a well-established cohort of Chinese population, a vigorous quality assurance program and the same strict methodology used to ensure the quality of the data collection over the entire study period.
A vigorous quality assurance program and the same strict methodology are used to ensure the quality of the data collection over the entire study period.
Fig. 3 Procedures of data collection over the semester.
However, data collection was over the same winter period for all classes, so all classes were disrupted by poor weather.
The mean value substitution method replaces the missing value with the average value calculated over all the values available from the other waves of data collection for the same individual.
Since cocaine use could be seen as stable and that sampling frames, mode of administration and data collection were the same for surveys in each age segment and estimates were averaged over the surveys.
What many people don't realize is that national data collection works the same way.
Data collection is the same for the RCT and PPS.
The three studies relied on primary data collection with the same methodology,[ 16- 18] including recruitment of all hospital deliveries in the city (over 98% of all deliveries).
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