Depicting and comparing the time to normalize

Erythrocyte sedimentation rate (ESR) is one of the predictors of improvement in handling rheumatoid arthritis. This study was designed to define and compare the time of achieving normal ESR and also the percentage for the normalization of this marker at several points of time in two different combination therapies. Fifty-two rheumatoid arthritis patients randomly received methotrexate, chloroquine, prednisolone (MCP) or azathioprine, chloroquine, prednisolone (ACP) and all were followed up for 34 weeks. Chloroquine and azathioprine were given, 150 mg/d and 2 mg/kg/d, respectively. Methotrexate was given, 0.2 mg/kg/week and simultaneously increased 2.5 mg monthly if no clinical response was seen. Prednisolone was started, 0.3 mg/kg/d and tapered after one week. ESR at baseline and during follow-up were checked. The data were collected and analyzed. This clinical trial was registered in the Iranian Registry of Clinical Trials (www.irct.ir) with registration number ID: 2012110611383N1. The percentages of obtaining normal ESR after 2nd, 4th, 6th, 8th, 18th, 34th weeks of follow up were 42.4%, 53.9%, 57.7%, 65.4%, 88.5%, 96.2% in the MCP group and 47.9%, 65.3%, 74%, 78.3%, 82.7%, 87% in the ACP group. The mean time of obtaining normal ESR was 9.15 (95%CI, 5.58 to 12.73) weeks in MCP group and 9.04 (4.04 to 14.05) weeks in the ACP group (p>0.05). The results show that the time to achieve normal ESR and percentage of its normalization were almost the same in both treated groups.