Healthcare resources were defined as hospital admissions, therapeutic warm baths, physiotherapist visits, and outpatient physician visits. Healthcare resource utilization was evaluated using a questionnaire asking patients whether or not they had used the healthcare resource during the 48 weeks of treatment.

All patients who completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug and had at least 1 post-baseline assessment.

Healthcare resources were defined as hospital admissions, therapeutic warm baths, physiotherapist visits, and outpatient physician visits. Healthcare resource utilization was evaluated using a questionnaire asking all patients whether or not they had used the healthcare resource during the 48 weeks of treatment, and if so, how many times the resource was used. The mean number of times is based on those patients who responded to the questionnaire stating they had utilized healthcare resources (see outcome measure 3).

All patients who completed study 0881A3-402 (NCT00247962), continued into study 0881A3-405, received at least 1 dose of study drug and had at least 1 post-baseline assessment.

The impact of treatment on work productivity was assessed by sick leave. Patients were asked whether or not they had taken sick leave during the 48 weeks of treatment, and if so, how many days.

All patients who completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug and had at least 1 post-baseline assessment.

Patients were asked whether or not they had taken sick leave during the 48 weeks of treatment, and if so, how many days. The mean number of days is based on those patients who had sick leave during the treatment period.

All patients who completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug and had at least 1 post-baseline assessment.

Patient Global Assessment of Disease Activity was measured on a 0 to 100 mm Visual Analog Scale (VAS), with 0 mm = no disease activity. The 0881A3-402 (NCT00247962) baseline score was used as the baseline for this analysis. Change = baseline - week 38.

All patients who completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug and had at least 1 post-baseline assessment

Total Back Pain was measured on a 0 to 100 mm VAS, with 0 mm indicating no pain. The 0881A3-402 (NCT00247962) baseline score was used as the baseline for this analysis. Change = baseline - week 38.

All patients who completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug and had at least 1 post-baseline assessment.

BASFI is a validated self assessment tool that determines the degree of functional limitation in Ankylosing Spodylitis (AS) patients. Utilizing a VAS of 0-10 (0=easy, 10=impossible), patients answered 10 questions assessing their ability in completing normal daily activities or physically demanding activities. The BASFI score is a mean score of the 10 questions, with a maximum score of 100 mm. The 0881A3-402 (NCT00247962) baseline score was used as the baseline for this analysis. Change = baseline - week 38.

All patients who completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug and had at least 1 post-baseline assessment.

BASDAI is a validated self assessment tool used to determine disease activity in patients with Ankylosing Spondylitis (AS). Utilizing a Visual Analog Scale (VAS) of 0-10 (0=none and 10=very severe) patient's answered 6 questions measuring discomfort, pain and fatigue. The final BASDAI score averages the individual assessments for a final score range of 0-10. The 0881A3-402 (NCT00247962) baseline score was used as the baseline for this analysis. Change = baseline - week 38.

All patients who received at least 1 dose of study drug and had at least 1 post-baseline assessment.

Healthcare resources were defined as hospital admissions, therapeutic warm baths, physiotherapist visits, and outpatient physician visits. Healthcare resource utilization was evaluated using a questionnaire asking patients whether or not they had used the healthcare resource during the 48 weeks preceding enrollment in study 0881A3-402 (NCT00247962) and during the 48 weeks of treatment in this extension study (0881A3-405).

All patients who took ETN and completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug and had at least 1 post-baseline assessment.

Patients were asked whether or not they had taken sick leave during the 48 weeks preceding enrollment in study 0881A3-402 (NCT00247962) and during the 48 weeks of treatment in this extension study (0881A3-405).

All patients who completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug and had at least 1 post-baseline assessment.

BASMI is an objective measure of spinal mobility. The BASMI score is composed of 5 measures: cervical rotation, intermalleolar distance, modified Schober's test, lateral flexion and tragus to wall distance. Each measure was scored 0-2 (0=normal mobility, 2=severe reduction) to give a final score ranging 0 to 10. The 0881A3-402 (NCT00247962) baseline score was used as the baseline for this analysis. Change = baseline - week 38.

All patients who completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug and had at least 1 post-baseline assessment.

BASDAI is a validated self assessment tool used to determine disease activity in patients with Ankylosing Spondylitis (AS). Utilizing a Visual Analog Scale (VAS) of 0-10 (0=none and 10=very severe) patient's answered 6 questions measuring discomfort, pain and fatigue. The fatigue-specific score is presented here. The 0881A3-402 (NCT00247962) baseline score was used as the baseline for this analysis. Change = baseline - week 38.

All patients who completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug and had at least 1 post-baseline assessment.

ASQoL is a questionnaire that assesses disease-specific quality of life (QoL). It consists of 18 statements that are relevant to the physical and mental conditions for a patient with Ankylosing Spondylitis (AS): mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each statement is answered by the patient as a 'Yes' (scored as 1) or 'No' (scored as 0). All item scores are summed to give a total score. Total score can range from 0 (good QoL) to 18 (poor QoL). The 0881A3-402 baseline score was used as the baseline for this analysis. Change = baseline - week 38.

All patients who completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug, had at least 1 post-baseline assessment, and completed 38 weeks.

Haywood quality of life instrument was utilized in the United Kingdom as the ASQoL measure. The ASQoL is an AS-specific measure of QoL, scores range from 0 (good QoL) to 80 (poor QoL). ASQoL is intended to measure the quality of life by means of questions about mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Patient's 0881A3-402 baseline score was used in the analysis. Change=baseline-week 38.

All patients from United Kingdom sites who completed study 0881A3-402 (NCT00247962), continued into this study, received at least 1 dose of study drug had at least 1 post-baseline assessment and completed 38 weeks.