Placebo subcutaneous injections (SC) every 4 weeks from Week 0 for up to 5 years (unless early escape at week 28); Methotrexate - 10 to 20 mg weekly from Week 0 for up to 5 years; Golimumab - if early escape, 50 mg SC injections every 4 weeks from Week 28 up to 5 years; Golimumab - Dr's discretion after unblinding (in participants receiving methotrexate plus placebo), 50 mg SC injections every 4 weeks up to 5 years; Golimumab- Dr's discretion after unblinding, dose adjusted from 50 to 100 mg and from 100 to 50mg. Duration of the blinded period was until the week-52 database lock.

Golimumab 100 mg SC injections every 4 weeks from Week 0 for up to 5 years; placebo capsules weekly from Week 0 for up to 5 years (unless early escape at Week 28); Methotrexate - if early escape, 10 to 20 mg weekly from Week 28 up to 5 years; Methotrexate - Dr's discretion after unblinding (in participants receiving golimumab plus placebo) 10 to 20 mg weekly for up to 5 years; Golimumab - Dr's discretion after unblinding, dose adjusted from 100 to 50mg. Duration of the blinded period was until the week-52 database lock.

Golimumab 50 mg SC injections every 4 weeks from Week 0 for up to 5 years (unless early escape at week 28); Methotrexate - 10 to 20 mg weekly from Week 0 for up to 5 years; Golimumab - if early escape, 100 mg SC injections every 4 weeks from Week 28 for up to 5 yrs; Golimumab - Dr's discretion after unblinding, dose adjusted from 50 to 100 mg and from 100 to 50mg. Duration of the blinded period was until the week-52 database lock.

Golimumab 100 mg SC injections every 4 weeks from Week 0 for up to 5 years; Methotrexate - 10 to 20 mg weekly from Week 0 for up to 5 years; Golimumab - Dr's discretion after unblinding, dose adjusted from 100 to 50mg. Duration of the blinded period was until the week-52 database lock.

Combines Group 3 (golimumab 50 mg + methotrexate) and Group 4 (golimumab 100 mg + methotrexate)

Null hypothesis: No difference in ACR 50 response comparing Group 1 vs combined Groups 3 and 4. The sample size of 150 patients per treatment group will provide >98% power to detect a difference in ACR 50 response between treatment groups at alpha=0.05, assuming 50% of patients with screening C-reactive protein (CRP)<1.5mg/dL, and the difference in ACR 50 response of 15-20% in patients with screening CRP<1.5mg/dL and 20-25% in subjects with screening CRP>=1.5mg/dL, between Groups 1 vs 3 or 4

Cochran-Mantel-Haenszel (CMH) test stratified by screening CRP (< 1.5 mg/dL; >= 1.5 mg/dL)

A positive test is concluded if there is a significant difference between golimumab+MTX and placebo+MTX and at least one of the pair-wise comparisons at a 0.05 level.

Placebo subcutaneous injections (SC) every 4 weeks from Week 0 for up to 5 years (unless early escape at week 28); Methotrexate - 10 to 20 mg weekly from Week 0 for up to 5 years; Golimumab - if early escape, 50 mg SC injections every 4 weeks from Week 28 up to 5 years; Golimumab - Dr's discretion after unblinding (in participants receiving methotrexate plus placebo), 50 mg SC injections every 4 weeks up to 5 years; Golimumab- Dr's discretion after unblinding, dose adjusted from 50 to 100 mg and from 100 to 50mg. Duration of the blinded period was until the week-52 database lock.

Placebo subcutaneous injections (SC) every 4 weeks from Week 0 for up to 5 years (unless early escape at week 28); Methotrexate - 10 to 20 mg weekly from Week 0 for up to 5 years; Golimumab - if early escape, 50 mg SC injections every 4 weeks from Week 28 up to 5 years; Golimumab - Dr's discretion after unblinding (in participants receiving methotrexate plus placebo), 50 mg SC injections every 4 weeks up to 5 years; Golimumab- Dr's discretion after unblinding, dose adjusted from 50 to 100 mg and from 100 to 50mg. Duration of the blinded period was until the week-52 database lock.

Placebo subcutaneous injections (SC) every 4 weeks from Week 0 for up to 5 years (unless early escape at week 28); Methotrexate - 10 to 20 mg weekly from Week 0 for up to 5 years; Golimumab - if early escape, 50 mg SC injections every 4 weeks from Week 28 up to 5 years; Golimumab - Dr's discretion after unblinding (in participants receiving methotrexate plus placebo), 50 mg SC injections every 4 weeks up to 5 years; Golimumab- Dr's discretion after unblinding, dose adjusted from 50 to 100 mg and from 100 to 50mg. Duration of the blinded period was until the week-52 database lock.

Golimumab 100 mg SC injections every 4 weeks from Week 0 for up to 5 years; placebo capsules weekly from Week 0 for up to 5 years (unless early escape at Week 28); Methotrexate - if early escape, 10 to 20 mg weekly from Week 28 up to 5 years; Methotrexate - Dr's discretion after unblinding (in participants receiving golimumab plus placebo) 10 to 20 mg weekly for up to 5 years; Golimumab - Dr's discretion after unblinding, dose adjusted from 100 to 50mg. Duration of the blinded period was until the week-52 database lock.

Placebo subcutaneous injections (SC) every 4 weeks from Week 0 for up to 5 years (unless early escape at week 28); Methotrexate - 10 to 20 mg weekly from Week 0 for up to 5 years; Golimumab - if early escape, 50 mg SC injections every 4 weeks from Week 28 up to 5 years; Golimumab - Dr's discretion after unblinding (in participants receiving methotrexate plus placebo), 50 mg SC injections every 4 weeks up to 5 years; Golimumab- Dr's discretion after unblinding, dose adjusted from 50 to 100 mg and from 100 to 50mg. Duration of the blinded period was until the week-52 database lock.

Golimumab 100 mg SC injections every 4 weeks from Week 0 for up to 5 years; placebo capsules weekly from Week 0 for up to 5 years (unless early escape at Week 28); Methotrexate - if early escape, 10 to 20 mg weekly from Week 28 up to 5 years; Methotrexate - Dr's discretion after unblinding (in participants receiving golimumab plus placebo) 10 to 20 mg weekly for up to 5 years; Golimumab - Dr's discretion after unblinding, dose adjusted from 100 to 50mg. Duration of the blinded period was until the week-52 database lock.