Table 2.

Statement of participants, interventions, comparisons, outcomes, and study design (PICOS).

Participants (P)	Patients diagnosed with HG.
Interventions (I)	The treatment group received the common forms of acupuncture solely or combined with other treatments, regardless of acupoint selection, treatment frequency, or course.
	The control group adopted conventional symptomatic treatment, conventional medication, placebo, sham, or no treatment.
	The two groups could receive the same basic treatment.
Comparisons (C)	The control group adopted conventional treatment, medication, placebo acupuncture, sham acupuncture, or no treatment.
Outcomes (O)	The effective rate, conversion rate of urine ketone, symptom improvement rate, serum potassium, hospital stay, pregnancy termination rate, adverse events, and recurrence.
Study design (S)	RCT.