Impact of obesity on endometrial blood flow in women without polycystic ovarian syndrome during intracytoplasmic sperm injection

Table 3 Spiral flow parameters in women without PCOS whose subendometrial flow can be detected (n = 165) according to BMIs (kg/m ² )

	BMI < 18.5	18.5 ≤ BMI < 24	24 ≤ BMI < 28	BMI ≥ 28	P
	(n = 33)	(n = 69)	(n = 34)	(n = 29)
Spiral PI	1.00 (0.80-1.39)	0.96 (0.75-1.45)	1.14 (0.78-1.55)	1.29 (0.77-1.62)	<0.05 ^{a, b}
Spiral RI	0.59 (0.52-0.64)	0.60 (0.52-0.67)	0.61 (0.56-0.62)	0.61 (0.56-0.70)	0.483
Spiral S/D	2.91 (2.72-3.21)	2.90 (2.60-3.24)	2.95 (2.70-3.41)	3.02 (2.71-3.35)	0.382

Note: Values are median (range). RI resistance index, PI pulsatility Index, S/D the ratio between peak systolic flow and lowest diastolic flow.
^a P value obtained by group-to-group comparison, BMI < 18.5 kg/m² vs. ≥28 kg/m².
^b P value obtained by group-to-group comparison, 18.5 ≤ BMI < 24 kg/m² vs. ≥28 kg/m².

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