Dylewski Drew A, Jamison Margaret G, Borawski Kristy M, Sherman Neil D, Amundsen Cindy L, Webster George D
Division of Urology/Urogynecology, Duke University Medical Center, Durham, North Carolina 27710, USA.
Neurourol Urodyn. 2007;26(1):3-7. doi: 10.1002/nau.20352.
Pad per day (PPD) usage is a frequently utilized measure of urinary incontinence. The 24-hour pad weight test (24PWT) is a reproducible test for quantifying incontinence volumes. We investigated whether PPD validly reports the magnitude of urinary incontinence.
This was a retrospective review of patients undergoing stress incontinence surgery from July 2002 to 2005. Inclusion criteria were a documented 24PWT and patient-reported PPD usage. Grams of urine loss per pad (GPP) provided a third measure of incontinence. Descriptive statistics and correlations between all variables and significance were noted. Factor analysis was performed on the three measures of leakage and age for all patients over age 50.
One hundred forty-five male and 116 female patients met inclusion criteria. Correlated against 24PWT, GPP has the strongest association with a correlation of 0.80 for males and 0.88 for females. PPD has a weaker correlation of 0.64 for males and 0.61 for females (R2 = 0.38 overall). Factor analysis identified two components associated with incontinence. A "leakage" component correlated best with 24PWT and GPP. Additionally, an "age" component implies that despite stable 24PWT values, older patients increase GPP while PPD decreases.
Self-reported PPD is an unreliable measure of incontinence as this variable only measures 38% of the variation of urinary incontinence volume. Patients at a given PPD level present with a wide range of 24PWT values. Older patients have higher per-pad leakage. Future incontinence studies should report 24PWT to ensure the most reliable and uniform data.
每日尿垫使用量（PPD）是常用于衡量尿失禁的指标。24小时尿垫重量试验（24PWT）是一种可重复的用于量化尿失禁量的试验。我们研究了PPD是否能有效反映尿失禁的程度。
这是一项对2002年7月至2005年接受压力性尿失禁手术患者的回顾性研究。纳入标准为有记录的24PWT和患者报告的PPD使用情况。每片尿垫的尿量损失克数（GPP）提供了另一种衡量尿失禁的指标。记录所有变量之间的描述性统计、相关性及显著性。对所有50岁以上患者的三种漏尿指标和年龄进行因子分析。
145例男性和116例女性患者符合纳入标准。与24PWT相比，GPP的相关性最强，男性为0.80，女性为0.88。PPD的相关性较弱，男性为0.64，女性为0.61（总体R2 = 0.38）。因子分析确定了与尿失禁相关的两个成分。一个“漏尿”成分与24PWT和GPP的相关性最佳。此外，一个“年龄”成分表明，尽管24PWT值稳定，但老年患者GPP增加而PPD减少。
自我报告的PPD是一种不可靠的尿失禁衡量指标，因为该变量仅能反映尿失禁量变化的38%。处于给定PPD水平的患者24PWT值范围较宽。老年患者每片尿垫的漏尿量更高。未来的尿失禁研究应报告24PWT以确保数据最可靠且统一。
