The total undiscounted cost per participant in the insulin glargine arm was $ 13,491 ( $ 13,080 to $ 14,254 ) versus $ 11,189 ( $ 10,568 to $ 12,147 ) for standard care , an increase of $ 2303 ( $ 1370 to $ 3235 ; p < 0.0001 ) ; the discounted increase was $ 2099 ( $ 1276 to $ 2923 ; P < 0.0001 ) .