High-Normal Preconception TSH Levels Have No Adverse Effects on Reproductive Outcomes in Infertile Women Undergoing the First Single Fresh D5 Blastocyst Transfer

Table 1

The general characteristics of the included women based on TSH levels.

	TSH (0.27–2.5)	TSH (2.5–4.2)
N	460	364
Age (years)	29.92 (4.02)	29.98 (3.82)	0.839
BMI (kg/m^2)	23.40 (3.09)	23.78 (3.26)	0.093
AMH (pmol/L)	34.68 (20.04)	37.40 (24.68)	0.082
FT4 (pmol/L)	16.62 (2.01)	16.47 (2.10)	0.248
Basal FSH (IU/L)	6.70 (1.77)	6.88 (1.68)	0.142
Endometrial thickness (mm)	11.66 (2.24)	11.80 (2.28)	0.384
Duration of infertility (year)	3.11 (2.38)	3.37 (2.52)	0.132
Number of retrieved oocytes	17.34 (4.51)	17.73 (4.75)	0.229
Insemination method of transferred blastocyst			0.542
IVF	363 (78.9%)	294 (80.8%)
ICSI	97 (21.1%)	70 (19.2%)
Quality of transferred blastocyst			0.189
Top quality	359 (78.0%)	269 (73.9%)
Nontop quality	101 (22.0%)	95 (26.1%)
Ovarian stimulation protocol			0.998
GnRH agonist	449 (97.6%)	356 (97.8%)
GnRH antagonist	11 (2.4%)	8 (2.2%)
Type of infertility			0.292
Primary	218 (47.4%)	186 (51.1%)
Secondary	242 (52.6%)	178 (48.9%)
Causes of infertility			0.279
Male factors	102 (22.2%)	78 (21.4%)
Female mixed factors	26 (5.7%)	17 (4.8%)
Ovulation failure	34 (7.3%)	31 (8.5%)
Pelvic and fallopian tube factors	168 (36.5%)	110 (30.2%)
Factors on both sides	101 (22.0%)	98 (26.9%)
Unexplained	29 (6.3%)	30 (8.2%)
Examination of uterine and fallopian tubes			0.885
Hysterosalpingography	269 (58.5%)	208 (57.1%)
Four-dimensional contrast enhanced ultrasound	11 (2.4%)	10 (2.7%)
Hysteroscopy	97 (21.1%)	84 (23.1%)
Others	83 (18.0%)	62 (17.0%)