Transition Dynamics of County Obstetric Service Absence: Population Exposure and Status Changes in the United States, 2015-2023.

چکیده اصلی

OBJECTIVE: To quantify persistence and transition dynamics of county obstetric service absence and assess whether birth volume and physician supply add predictive information beyond prior-year status. STUDY SETTING AND DESIGN: National longitudinal county-year panel study (2015-2023). Obstetric service absence was defined using a 2-year confirmation rule, with contemporaneous status used for the 2015 baseline year to reduce misclassification. We estimated annual conditional transition probabilities (entry and exit) and modeled current-year absence as a function of prior-year absence and year fixed effects, with and without contemporaneous birth volume and physician supply. DATA SOURCES AND ANALYTIC SAMPLE: All US counties (N = 3144) observed annually. Obstetric service availability was identified from Centers for Medicare & Medicaid Services Provider of Services files. Residence-based births, physician supply, and bed capacity were obtained from the Area Health Resources Files. Population denominators for women aged 15-44 were drawn from the American Community Survey. PRINCIPAL FINDINGS: Obstetric service absence was highly persistent. County prevalence was stable (34.2% in 2015 and 34.2% in 2023). Population exposure declined: the share of women aged 15-44 residing in counties without services decreased from 6.5% to 5.3%, and the share of births to residents of such counties decreased from 6.6% to 5.7%. Annual transitions were rare (entry ≤ 0.4%; exit ≤ 0.9%), and conditional stay probabilities were ≥ 0.991 for both presence and absence. In lagged-status models, prior-year absence strongly predicted current absence (0.994); adding birth volume and physician supply did not materially change the estimate (0.993). CONCLUSIONS: On policy-relevant timescales, obstetric service absence behaves as a high-inertia system state. Rare transitions and dominance of prior status suggest slow adjustment, with implications for closure prevention and targeting support near volume and workforce feasibility thresholds.

ترجمه فارسی چکیده

هدف: کمی‌سازی پایداری و دینامیک‌های گذار از نبود خدمات زنان‌درمانی در شهرستان‌ها و بررسی اینکه آیا حجم تولد و موجودی پزشکان اطلاعات پیش‌بینی‌کننده‌ای فراتر از وضعیت سال قبل ارائه می‌دهند. طراحی: مطالعه پنلی طولی ملی شهرستان-سال (۲۰۱۵-۲۰۲۳). نبود خدمات زنان‌درمانی با استفاده از قانون تأیید دو ساله تعریف شد. نتایج کلیدی: نبود خدمات زنان‌درمانی بسیار پایدار بود. شیوع در شهرستان‌ها ثابت بود (۳۴.۲٪ در ۲۰۱۵ و ۳۴.۲٪ در ۲۰۲۳). مواجهه جمعیتی کاهش یافت. انتقالات سالانه نادر بود. در مدل‌های وضعیت تأخیری، نبود سال قبل به شدت وضعیت فعلی را پیش‌بینی کرد. نتیجه‌گیری: در مقیاس‌های سیاست‌گذاری، نبود خدمات زنان‌درمانی مانند یک حالت با اینرسی بالا عمل می‌کند.

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