p-value is from the pairwise comparison of methotrexate monotherapy and Humira/ methotrexate combination therapy using the Mann-Whitney U test. b p-value is from the pairwise comparison of Humira monotherapy and Humira/ methotrexate combination therapy using the Mann-Whitney U test c p-value is from the pairwise comparison of Humira monotherapy and methotrexate monotherapy using the Mann-Whitney U test