CPP	Central precocious puberty
GnRHa	Gonadotrophin-releasing hormone analogs
LH	Luteinizing hormone
FSH	Follicle-stimulating hormone
BMI	Body mass index
NOS	Newcastle Ottawa Scale
BMD	Bone mineral density
MD	Mean difference
CIs	Confidence intervals
RR	Risk ratio
SDS	Standard deviation score
PCOS	Polycystic ovary syndrome