J Hematol

Journal of Hematology, ISSN 1927-1212 print, 1927-1220 online, Open Access

Article copyright, the authors; Journal compilation copyright, J Hematol and Elmer Press Inc

Journal website http://www.thejh.org

Original Article

Volume 9, Number 1-2, April 2020, pages 9-12

Factors Associated With Umbilical Cord Blood Collection Quality in Japan

Tables

**Table 1.** Results of Univariate Logistic Regression Analyses Concerning the Association Between Possible Factors of UCB Collection Methods and the UCB Quality (Presence or Absence of Clots)
Factor of UCB collection	Presence of clots		P value	Crude ORs	95% CI
Factor of UCB collection	No	Yes	P value	Crude ORs	95% CI
OR: odds ratio; CI: confidence interval; UCB: umbilical cord blood.
Collection during vaginal delivery only
Yes	1,121	407	0.67	0.963	0.82 - 1.1
No	1,010	353
Missing data	0	0
Clamp the tube to prevent air contamination
Yes	1,379	517	0.34	0.896	0.71 - 1.1
No	333	111
Missing data	460	136
Puncture with needle hole facing up
Yes	1,738	154	0.03	1.47	1.0 - 2.0
No	393	51
Missing data	0	545
Puncture the umbilical cord near the placenta
Yes	1,325	567	< 0.01	0.619	0.48 - 0.79
No	351	93
Missing data	455	100
Puncture the thick part of the Walton Jelly
Yes	1,146	282	0.07	1.21	0.99 - 1.5
No	248	746
Missing data	737	14
Single puncture only
Yes	1,307	585	< 0.01	1.45	1.2 - 1.8
No	269	175
Missing data	555	0
Continuous massage of the uterine fundus during collection
Yes	1,383	509	0.19	1.16	0.93 - 1.5
No	311	133
Missing data	161	118
Avoid squeezing the umbilical cord
Yes	426	18	< 0.01	3.24	2.0 - 5.3
No	1,685	212
Missing data	25	530
In utero collection only
Yes	1,298	594	0.06	1.23	0.99 - 1.53
No	384	160
Missing data	549	6
Continuous stirring of the bag during collection
Yes	1,538	354	0.09	0.691	0.42 - 1.1
No	367	75
Missing data	226	336

**Table 2.** Results of Multivariate Logistic Regression Analyses Concerning the Association Between Possible Factors of UCB Collection Methods and the UCB Quality (Presence or Absence of Clots)
Factor of umbilical cord blood collection	P value	Adjusted ORs	95% CI
OR: odds ratio; CI: confidence interval; UCB: umbilical cord blood.
Puncture the umbilical cord near the placenta	0.09	1.02	0.91 - 1.2
Puncture with needle hole facing up	0.052	1.41	0.98 - 1.8
Single puncture only	0.01	1.80	1.3 - 5.4
Avoid squeezing the umbilical cord	0.11	1.29	0.91 - 1.8