Please assess the completion status of the following clinical trial:

Trial Title: Efficacy of Premixed Nitrous Oxide and Oxygen in Patient With Out-of-hospital Moderate Acute Pain

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Patients aged 18 years old~* Patients with a moderate acute pain (NRS score between 3 and 6)~Exclusion Criteria:~* Contraindication of premixed 50% nitrous oxide and oxygen~* Recent treatment of analgesic (less than 6 hours)

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- premixed 50% nitrous oxide and oxygen (Type: EXPERIMENTAL): None
- medical air (Type: PLACEBO_COMPARATOR): None

Based on this trial design, predict the completion outcome and termination type (if applicable).