Please assess the completion status of the following clinical trial:

Trial Title: Using Preoperative Anxiety Score to Determine the Precise Dose of Butorphanol for Sedation

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE2
- Number of Arms: 4.0

Eligibility Criteria:
Inclusion Criteria:~* ASA Ⅰ-Ⅱ~* age 18-75 years~* surgical operation of lower extremities in orthopedics~* no contraindication of epidural anesthesia~Exclusion Criteria:~* with central system disease~* with cardiovascular disease~* with autonomic nervous system disease~* long term use of analgesic drugs ,sedative drugs,and anti-anxiety drugs~* language barrier~* unwilling to cooperate with the experimenter

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 75 Years
- Healthy Volunteers: f

Study Arms:
- High anxiety butorphanol group (Type: EXPERIMENTAL): preoperative anxiety score of Amsterdam pre-operative anxiety and information scale(APAIS) in high anxiety butorphanol group were \>10，and received an intravenous loading dose of 15ug/kg butorphanol 5 mins before starting the surgery, then followed by infusion of 7.5ug/kg/h butorphanol and stopped infusion when the Ramsay sedation score (RSS) reached 4
- High anxiety 0.9% saline group (Type: PLACEBO_COMPARATOR): preoperative anxiety score of Amsterdam pre-operative anxiety and information scale(APAIS) in high anxiety 0.9% saline group were \>10, and received an infusion of the same volume of 0.9% saline
- Low anxiety butorphanol group (Type: EXPERIMENTAL): preoperative anxiety score of Amsterdam pre-operative anxiety and information scale(APAIS) in low anxiety butorphanol group were ≤10,and received an intravenous loading dose of 15ug/kg butorphanol 5 mins before starting the surgery, then followed by infusion of 7.5ug/kg/h butorphanol and stopped infusion when the Ramsay sedation score (RSS) reached 4
- Low anxiety 0.9% saline group (Type: PLACEBO_COMPARATOR): preoperative anxiety score of Amsterdam pre-operative anxiety and information scale(APAIS) in low anxiety 0.9% saline group were ≤10, and received an infusion of the same volume of 0.9% saline

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