Estimating patterns of CD4 lymphocyte decline using data from a prevalent cohort of HIV infected individuals.
Estimating patterns of CD4 lymphocyte decline using data from a prevalent cohort of HIV infected individuals.
复制标题
使用来自流行的 HIV 感染者群体的数据来估计 CD4 淋巴细胞下降的模式。
DOI:
10.1002/sim.4780131103
复制
发表时间:
1994
影响因子:
2
通讯作者:
Jewell,NP
中科院分区:
文献类型:
--
作者:
Vittinghoff,E;Malani,HM;Jewell,NP
In natural history studies of chronic disease, it is of interest to understand the evolution of key variables that measure aspects of disease progression. This is particularly true for immunological variables among persons infected with the human immunodeficiency virus (HIV). The natural time scale for such studies is time since infection. Most data available for analysis, however, arise from prevalent cohorts, where the date of infection is unknown for most or all individuals. As a result, standard curve fitting algorithms are not immediately applicable. Here we propose two methods to circumvent this difficulty. The first uses repeated measurement data to provide information not only on the level of the variable of interest, but also on its rate of change, and is based on the principal curves algorithm of Hastie and Stuetzle. The second uses an external estimate of the expected time since infection. Both methods use locally‐weighted linear smoothers, and are applied to data from a prevalent cohort of HIV‐infected homosexual men, giving estimates of the average pattern of CD4 lymphocyte decline. These methods apply to natural history studies that use data from prevalent cohorts where the time of disease origin is uncertain, provided availability of certain information from external sources.
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DOI:
--
发表时间:
1990
期刊:
Journal of Acquired Immune Deficiency Syndromes
影响因子:
--
作者:
S. G. Machado;Mitchell H. Gail;Susan S. Ellenberg
通讯作者:
Susan S. Ellenberg
DOI:
--
发表时间:
1991
期刊:
Journal of acquired immune deficiency syndromes
影响因子:
--
作者:
Sheppard,HW;Ascher,MS;Busch,MP;Sohmer,PR;Stanley,M;Luce,MC;Chimera,JA;Madej,R;Rodgers,GC;Lynch,C
通讯作者:
Lynch,C
DOI:
10.1093/infdis/164.5.962
发表时间:
1991
期刊:
The Journal of infectious diseases
影响因子:
--
作者:
L. Pan;H. Sheppard;W. Winkelstein;J. Levy
通讯作者:
J. Levy
DOI:
--
发表时间:
1989
期刊:
Journal of acquired immune deficiency syndromes
影响因子:
--
作者:
Lang,W;Perkins,H;Anderson,RE;Royce,R;Jewell,N;WinkelsteinJr,W
通讯作者:
WinkelsteinJr,W
影响因子:
1.9
作者:
ZEGER, SL;DIGGLE, PJ
通讯作者:
DIGGLE, PJ