A sign is taped to the window of a business on October 3 in Miami. Due to the government shutdown, the Bureau of Labor Statistics is not releasing any official federal employment data. Joe Raedle/Getty Images

The latest — and only — comprehensive look at the health of the US labor market showed Wednesday that the economy added an estimated 42,000 private-sector jobs last month.

Payroll processing company ADP released the scheduled data Wednesday during the country’s longest government shutdown, which has created a blackout of critical federal data on key economic measures like jobs and inflation.

ADP’s monthly tally has shown a significant slowdown in the job market since the summer, with net losses for September and August. Following revisions released Wednesday, there weren’t as man

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