Relative to participants in the control group , CHWs had a positive impact on net HbA@c improvements at @ months ( -@ % -LSB- -@ mmol/mol -RSB- ) , @ months ( -@ % -LSB- -@ mmol/mol -RSB- ) , @ months ( -@ % -LSB- -@ mmol/mol -RSB- ) , and @ months ( -@ % -LSB- -@ mmol/mol -RSB- ) .