The Kaplan-Meier Estimate for Dependent Failure Time Observations

Ying, Zhang; Wei, L. J.

doi:10.1006/jmva.1994.1031

Cited by 96 publications

(87 citation statements)

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“…As some of the patients received more than one FPD, data is clustered. Therefore the variances of the Kaplan-Meier estimates are based on the adjusted formula proposed in Ying and Wei (1994). Further the incidence probabilities for technical failures were estimated with the Aalen-Johansen estimator (Aalen 1978) in separate competing risk models (see Andersen et al 1993).…”

Section: Discussionmentioning

confidence: 99%

Technical complications of implant‐supported fixed partial dentures in partially edentulous cases after an average observation period of 5 years

Kreissl

Gerds

Muche

et al. 2007

Clinical Oral Implants Res

161

129

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OBJECTIVES: The purpose of this prospective long-term study was to evaluate the incidence of the most common technical problems, namely screw loosening, screw fracture, fracturing of veneering porcelain and framework fracture in implant-supported fixed partial dentures (FPDs), and assess the survival and success rate (event-free survival) after 5 years of function. MATERIALS AND METHODS: In 76 partially edentulous patients, a total of 205 3i-implants (machined surface) were placed and restored with 112 implant-supported FPDs (46 single crowns, 81 splinted crowns, seven FPD bridges and 23 FPDs with cantilevers). The survival rate of FPDs supported by implants was 94.5% (CI-95: 90.1-98.8) after an average observation period of 5 years. The success rate (event-free survival) of the FPDs was 80% . After an observation period of 5 years the cumulative incidence of screw loosening was 6.7% (CI-95: 1.8-11.5), the cumulative incidence for screw fracture was 3.9% (CI-95: 0.1-7.7). Fracture of the veneering porcelain occurred in 5.7% (CI-95: 1.2-10.2) of all FPDs. Fracturing of the suprastructure framework was rare (1%; CI-95: 0-2.9). The overall complication incidence after 5 years was highest in the group of FPDs with cantilever, which showed the lowest success rate 68.6% (CI-95: 50-87.3), followed by single crowns (77.6%; CI-95: 53.3-100) and splinted crowns (86.1%; CI-95: 59.5-100). No complication occurred in FPD bridges. CONCLUSION: Fixed partial dentures supported by 3i-implants showed low technical complications rates, the most common being loosening of the abutment screw. Managing these complications can cause extra amount of chair-side time and patient dissatisfaction. AbstractThe purpose of this prospective long-term study was to evaluate the incidence of the most common technical problems namely screw loosening, screw fracture, fracturing of veneering porcelain and framework fracture in implant-supported FPDs and assess the survival and success rate (event-free survival) after five years of function.In 76 Conclusion:Fixed partial dentures supported by 3i-implants showed low technical complications rates, the most common being loosening of the abutment screw. Managing these complications can cause extra amount of chair-side time and patient dissatisfaction.

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Section: Discussionmentioning

confidence: 99%

Technical complications of implant‐supported fixed partial dentures in partially edentulous cases after an average observation period of 5 years

Kreissl

Gerds

Muche

et al. 2007

Clinical Oral Implants Res

161

129

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“…Clearance analysis was restricted in incident cases while newly acquired infections identified at a participant's last visit were not included. Median time to clearance and 95% CIs were estimated for groups of HPV using the clustered Kaplan-Meier method (29), and the Wei Lin Weissfeld (WLW) marginal model approach was used to assess the statistical significance between HPV groups (30).…”

Section: Discussionmentioning

confidence: 99%

Prevalence, Incidence, Clearance, and Associated Factors of Genital Human Papillomavirus Infection among Men: A Population-Based Cohort Study in Rural China

Liu

Zhang

et al. 2014

Cancer Epidemiology, Biomarkers &Amp; Prevention

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Background: The natural history of human papillomavirus (HPV) infection in men on a population base has rarely been studied in general, particularly among Chinese men.Methods: A total of 1,286 men ages 25 to 65 years from rural China were enrolled during 2009-2010 and their genital HPV infection status was assessed biannually for up to seven visits using PCR and sequencing methods. Prevalence analysis was performed among men with at least one valid HPV result (N ¼ 1,279) and men with at least two consecutive HPV results (N ¼ 1,059) were included in incidence and clearance analyses (median follow-up time, 31.8 months; interquartile range, 15.4-37.9 months).Results: The prevalence and incidence of any HPV type, oncogenic, and nononcogenic HPV were 17.8%, 6.4%, 12.4%, and 14.6, 4.9, 10.8 per 1,000 person months, respectively. The median duration of infection with any HPV type, oncogenic, and nononcogenic HPV was 11.5, 6.8, and 11.5 months, respectively. The number of lifetime sexual partners was consistently associated with increased risk of prevalent and incident infection of HPV. Men ages 25 to 50 years had a higher incidence and longer duration of HPV infection than older men (51-65 years).Conclusions and Impact: This epidemiologic investigation provides basic information of genital HPV infection among the Chinese male population; these data are crucial for the consideration of primary strategies against HPV-related carcinoma in the Chinese male and female population. Cancer Epidemiol Biomarkers Prev; 23(12); 2857-65. Ó2014 AACR.

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“…Voelkel and Crowley (1984) used an approach, based on semi-Markov processes, to establish a reasonable model in Cancer Research Clinical Trials assuming that each patient may either remain in an initial state, or progress, or respond and then possibly relapse. Ying and Wei (1994) explored consistency and asymptotic normality of F n (t) in the ,-mixing context. An application of the right censoring model was also given for a special dependent case, in which survival times are highly stratified.…”

Section: Introduction Assumptions and Statement Of Main Resultsmentioning

confidence: 99%