Vimpat® Added as Adjunctive Therapy to One Baseline Antiepileptic Drug

For the assessment of the Clinical Global Impression of Change (CGI-C), the investigator provided his/her assessment of the subject's clinical status compared to Baseline. He/she was asked to check the category that best describes the subject's condition over the past 6 months compared to Baseline: * Very much improved * Much improved * Minimally improved * No change * Minimally worse * Much worse * Very much worse

Time frame: Month 6

Population: Of the 520 subjects in the Full Analysis Set (FAS), 515 subjects are included in the analysis of this outcome measure.~FAS comprises all subjects who have been treated with Vimpat® at least once, who fulfill the inclusion criteria and for whom a valid baseline and post-baseline value of seizure frequency is available.

Baseline values for the seizure frequency (SF) during the 12 weeks time period prior to inclusion ('historical baseline'), and the post-baseline values of seizure frequency reported after 3 months were normalized to a 28 days interval. Change in number of partial-onset seizures was derived as follows: Change in SF per 28 days = (SF at 3 months per 28 days) - (SF at Baseline per 28 days). A negative value in change from Baseline means that the value has decreased from Baseline to Month 3. Partial-onset seizures can be classified into one of the following three groups: * Simple partial seizures * Complex partial seizures * Partial seizures evolving to secondarily generalized seizures.

Time frame: From Baseline to Month 3

Population: Of the 520 subjects in the Full Analysis Set (FAS), 449 subjects are included in the analysis of this outcome measure.~FAS comprises all subjects who have been treated with Vimpat® at least once, who fulfill the inclusion criteria and for whom a valid baseline and post-baseline value of seizure frequency is available.

Baseline values for the seizure frequency (SF) during the 12 weeks time period prior to inclusion ('historical baseline'), and the post-baseline values of seizure frequency reported after 6 months were normalized to a 28 days interval. Change in number of partial-onset seizures was derived as follows: Change in SF per 28 days = (SF at 6 months per 28 days) - (SF at Baseline per 28 days). A negative value in change from Baseline means that the value has decreased from Baseline to Month 6. Partial-onset seizures can be classified into one of the following three groups: * Simple partial seizures * Complex partial seizures * Partial seizures evolving to secondarily generalized seizures.

Time frame: From Baseline to Month 6

Population: Of the 520 subjects in the Full Analysis Set (FAS), 500 subjects are included in the analysis of this outcome measure.~FAS comprises all subjects who have been treated with Vimpat® at least once, who fulfill the inclusion criteria and for whom a valid baseline and post-baseline value of seizure frequency is available.

Baseline values for the seizure frequency (SF) during the 12 weeks time period prior to inclusion ('historical baseline'), and the post-baseline values of seizure frequency reported after 3 months were normalized to a 28 days interval. Change in number of partial-onset seizures with secondary generalization was derived as follows: Change in SF per 28 days = (SF at 3 months per 28 days) - (SF at Baseline per 28 days). A negative value in change from Baseline means that the value has decreased from Baseline to Month 3. Partial-onset seizures with secondary generalization can be classified into one of the following three groups: * Simple partial seizures evolving to generalized seizures * Complex partial seizures evolving to generalized seizures * Simple partial seizures evolving to Complex partial seizures evolving to generalized seizures.

Time frame: From Baseline to Month 3

Population: Of the 520 subjects in the Full Analysis Set (FAS), 447 subjects are included in the analysis of this outcome measure.~FAS comprises all subjects who have been treated with Vimpat® at least once, who fulfill the inclusion criteria and for whom a valid baseline and post-baseline value of seizure frequency is available.

Baseline values for the seizure frequency (SF) during the 12 weeks time period prior to inclusion ('historical baseline'), and the post-baseline values of seizure frequency reported after 6 months were normalized to a 28 days interval. Change in number of partial-onset seizures with secondary generalization was derived as follows: Change in SF per 28 days = (SF at 6 months per 28 days) - (SF at Baseline per 28 days). A negative value in change from Baseline means that the value has decreased from Baseline to Month 6. Partial-onset seizures with secondary generalization can be classified into one of the following three groups: * Simple partial seizures evolving to generalized seizures * Complex partial seizures evolving to generalized seizures * Simple partial seizures evolving to Complex partial seizures evolving to generalized seizures.

Time frame: From Baseline to Month 6

Population: Of the 520 subjects in the Full Analysis Set (FAS), 500 subjects are included in the analysis of this outcome measure.~FAS comprises all subjects who have been treated with Vimpat® at least once, who fulfill the inclusion criteria and for whom a valid baseline and post-baseline value of seizure frequency is available.

The number of subjects affected by any Treatment Emergent Adverse Event (TEAE) during the course of the study from Day 0 up to Month 6 is presented below.

Time frame: From Inclusion Visit (Day 0) up to Month 6

Population: All 571 subjects in the Safety Set are included in the analysis of this outcome measure.~Safety Set comprises all patients included who have been treated with Vimpat® at least once.