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要旨 消化性潰瘍の累積未治癒率あるいは累積未再発率の近似式は時間tの指数関数y=Ae-ktで表される.現実にはy=100:0≦t<Ti,y=100e-k(t-Ti):Ti≦tとなる.これより求められる理論値は観測値と極めてよく一致する.この式より求める回帰パラメーターはいずれも潰瘍の治癒速度,あるいは再発速度を表すものであり,k:未治癒率(未再発率減少速度定数),Ti:治癒(再発)発現期,T1/2:未治癒率(未再発率)半減期,T50:50%治癒(再発)時間と定義できる.この方法により,潰瘍の治癒と再発の速度論的解析が可能であり,今後,薬効評価はもとより,潰瘍の治癒と再発を規制する種々の因子の数量的評価に応用できるものである.
A trial of statistical analysis of the speed of ulcer healing and relapse is performed. A non-linear regression analysis is conducted between two variables “t” (time of observation) and “y” (non-healing or nonrelapse rate), obtaining an exponential function y=Ae-kt. Practically, the equation is y=100 : 0≦t<Ti, y=100e-k(t-Ti): Ti≦t.
The theoretical values obtained from the equation are very close to the observed values.
The regression parameters are defined as follows, k ; reduction rate constant of non-healing or non-relapse rates, Ti : initiation time of healing or relapse, T1/2: half-life of non-healing or non-relapse rate, and T50: time of 50% healing or relapse.
With this method, benefit or risk factors which regulate the healing or relapsing speed of peptic ulcer can be dynamically evaluated, being expressed by digital parameters.
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