SHANGHAI, Feb 1 (Reuters) - Growth in China's services sector activity slowed in January, the country's official non-manufacturing Purchasing Managers' Index (PMI) survey showed on Monday.

The official non-manufacturing PMI stood at 53.5 in January, compared with the previous month's reading of 54.4, above the 50-point mark that separates growth from contraction on a monthly basis.

(Edited by Sam Holmes)