After adjustment for sex , baseline FVC as a percentage of predicted , and baseline diffusing capacity of the lung for carbon monoxide as a percentage of predicted , patients taking anti-acid treatment at baseline had a smaller decrease in FVC at @ weeks ( -@ L , @ % CI -@ to -@ ) than did those not taking anti-acid treatment ( -@ L , -@ to -@ ; difference @ L , @ % CI @-@ ; p = @ ) .