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Table 1 Schedule of the study process (SPIRIT Figure)

From: Efficacy and safety of Dingkun pill for female infertility patients with low prognosis undergoing in vitro fertilization-embryo transfer: study protocol for a multicenter, double-blind, randomized, placebo-controlled trial

 Study period
EnrollmentAllocationPost allocation
Timepoint*1st visit0 week1–6 weeks7–12 weeks4–6 months
 Eligibility screen    
 Informed consent    
 Allocation by TCM team    
 DKP treatment    
 Placebo treatment    
 Basic ovarian reserve test (AFC, bFSH, AMH, etc.)    
 Laboratory index measurement (oocyte, zygote, embryo, etc.)    
 Pelvic ultrasound evaluation (endometrium thickness and classification)    
 IVF pregnancy outcome    
 Liver and renal function assessment