Patrick Frater Asia Bureau ChiefCinema box office in China fell back to the lower depths over the weekend, with just $8.9 million of revenue across a country of 1.3 billion inhabitants.Business continues to be badly hit by COVID-related closures as the disease shows signs of spread around the country, while slowly diminishing in Shanghai where there was a full lockdown that lasted many weeks.Business appeared to spike upwards a week earlier, driven by the May Day holiday. But Chinese state media reports that the Sunday to Wednesday May day period was down 82% compared with last year.The latest weekend box office total (Friday to Sunday) was the second lowest this year.