The frequency of Campylobacter infection at the time of enrolment differed significantly between age groups (Chi-squared test, p < 0.001).
In FGDs and IDIs, participants expressed concerns about the frequency of speculum examination (conducted at enrolment and six-monthly), did not see the value of genital examination if they were asymptomatic and also raised the issue of speculum cleanliness and safety.
Dietary intake that occurred at least 1 year before diagnosis or study enrolment was assessed at the time of enrolment using a semiquantitative food frequency questionnaire (FFQ) (Willett et al, 1985; Rimm et al, 1992).
Apart from the higher proportion of the RO33 allele (p = 0.030) in AP individuals during the transition compared to the rainy season, the frequency of alleles was independent of the season of enrolment.
We also reduced the burden on participants by limiting the size and frequency of questionnaires, so as to encourage enrolment and continued participation.
For the secondary analysis, the frequency of CAAs at week 4 after enrolment, that of defervescence, and level of treatment resistance, will be compared using the Mantel-Haenszel method.
We reduce the potential for confounding by frequency matching on the basis of intervention siting criteria, cluster size, and time of enrolment.
In a randomly selected subset of 35 children aged 12 23 months who received PHiD-CV at enrolment and 6 months later, the frequencies of antigen-specific memory B cells were assessed on the day of enrolment before vaccination and 1 month after each dose of PHiD-CV.
Low internal efficiency, particularly the high frequency of repetition, also explains the high gross enrolment rate and the number of over-aged children.
For traditional reasons, there were more males in the offspring group and, associated with male gender, a slightly increased age at enrolment and a higher frequency of smokers (Table 1).
