A 4-year prospective study of the progression of periodontal disease in a rural Chinese population

Mean annual attachment, bone level, and tooth loss: A systematic review

“…The completeness of follow‐up of the initial sample was at least 80% in two studies, 50% to 79% in five studies, below 50% in four studies, and unclear in five studies …”

“…Study duration/follow‐up was ≤5 years in nine studies, 6 to 10 years in four studies, and >10 years in three studies …”

“…Eight studies were epidemiologic samples, one was a birth cohort, one was a community cohort, two were specialist periodontal clinic or practice patients, and the status of four was unclear …”

“…The age groups of included participants varied. Five studies reported data on only participants <50 years, three studies reported only ≥50 years of age, seven studies included a wide age range, and one study was unclear …”

“…Both male and female participants were included in 11 studies, women only in two studies, men only in one study, and unclear in one study …”