Thailand's manufacturing production index (MPI) in January rose 0.18% from a year earlier, led by higher output of cars, air conditioners and sugar, the Industry Ministry said on Tuesday.
That compares with 1.1% increase forecast in a Reuters poll, and against December's 0.75% rise.
Capacity utilisation was at 70.49% in January after December's 66.88%.
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The ministry has forecast the MPI will increase between 2% and 3% this year, after 2018's 2.8% rise.