HONG KONG (AP) — China's factory activity shrank for a sixth straight month in September, the longest slump since 2019, an official report said Tuesday. The official manufacturing purchasing managers index, or PMI, improved to 49.8 from 49.4 in August. A private sector PMI survey by the credit research and rating startup RatingDog was more upbeat, with September’s overall PMI rising to 51.2 from 50.5 in August. The mixed manufacturing measures reflect persisting sluggish domestic demand and uncertainties over trade tensions with the United States. China’s official manufacturing PMIs first slipped back into contraction in April as trade friction with U.S. President Donald Trump's administration heated up after he took office.