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. 2022 Nov 15;10:1003361. doi: 10.3389/fpubh.2022.1003361

Table 2.

Baseline characteristics of the study population*.

Characteristic All EA Control P-value
(n = 110) (n = 55) (n = 55)
Age, y 0.054
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 32.60 ± 3.93 32.56 ± 4.27 32.77 ± 3.58
Min–Max 24–42 24–42 23.61–40.43
Median (IQR) 32.0 (5.0) 32.10 (6.78) 33.44 (4.90)
Height, m 0.443
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 160.35 ± 4.88 160.00 ± 5.33 160.69 ± 4.41
Min–Max 150–171 150–171 150–170
Median (IQR) 160 (7.3) 160 (8) 160 (6)
Mean weight before this pregnancy, kg 0.268
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 53.92 ± 6.97 52.98 ± 7.20 54.85 ± 6.67
Min–Max 42–75 42–70 42–75
Median (IQR) 53 (11) 52 (9) 55 (10)
Weight before this prenatal, kg 0.823
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 68.51 ± 8.07 67.71 ± 7.96 69.31 ± 8.17
Min–Max 52–98 53–89 52–98
Median (IQR) 68.0 (8.9) 68 (9.2) 70 (8)
Weight after childbirth, kg 0.729
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 61.32 ± 7.95 59.99 ± 7.39 62.65 ± 8.32
Min–Max 44–89 44–80 46–89
Median (IQR) 60.0 (9.25) 60.0 (10.5) 62.0 (10.0)
Mean BMI before this pregnancy, kg/m 2 0.598
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 20.99 ± 2.41 20.67 ± 2.42 21.48 ± 2.86
Min–Max 16.41–27.34 17.01–27.34 16.41–31.22
Median (IQR) 20.50 (3.06) 20.31 (2.77) 21.64 (4.02)
BMI before this prenatal, kg/m 2 0.921
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 26.62 ± 2.68 26.42 ± 2.53 27.18 ± 3.86
Min–Max 20.96–35.56 20.96–33.20 20.31–40.79
Median (IQR) 26.37 (2.92) 25.89 (2.52) 27.24 (4.86)
BMI after childbirth, kg/m 2 0.453
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 23.83 ± 2.74 23.40 ± 2.41 24.57 ± 3.83
Min–Max 17.42–32.30 18.31–28.76 18.07–37.04
Median (IQR) 23.44 (3.35) 23.03 (2.88) 24.38 (4.44)
Baby's birth weight, kg 0.330
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 3.42 ± 0.51 3.42 ± 0.47 3.42 ± 0.55
MinMax 2.076.0 2.074.56 2.56.0
Median (IQR) 3.4 (0.7) 3.42 (0.71) 3.40 (0.64)
Delivery mode, n (%) 0.529
Spontaneous vaginal delivery 59 (53.6) 28 (50.9) 31 (56.4)
Cesarean section 51 (46.4) 27 (49.1) 24 (43.6)
Past medical history, n (%) 0.782
Yes 15 (13.6) 7 (12.7) 8 (14.5)
No 95 (86.4) 48 (87.3) 47 (85.5)
Medication history, n (%) 0.697
Yes 7 (6.4) 3 (5.5) 4 (7.3)
No 103 (93.6) 52 (94.5) 51 (92.7)
Allergic history, n (%) 0.142
Yes 13 (11.8) 4 (7.3) 9 (16.4)
No 97 (88.2) 51 (92.7) 46 (83.6)
Previous abdominal surgery, n (%) 0.708
Yes 55 (50.0) 30 (54.5) 25 (45.5)
No 55 (50.0) 25 (45.5) 30 (54.5)
Number of pregnancies 0.868
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 1.91 ± 1.09 1.93 ± 1.21 1.89 ± 0.96
MinMax 17 17 15
Median (IQR) 2 (1) 1 (1) 2 (1)
Number of deliveries 0.478
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 1.47 ± 0.57 1.45 ± 0.57 1.49 ± 0.57
MinMax 13 13 13
Median (IQR) 1 (1) 1 (1) 1 (1)
Multiple or twin pregnancies, n (%) 0.978
Yes 2 (1.8) 1 (1.8) 1 (1.8)
No 108 (98.2) 54 (98.2) 54 (98.2)
Exercise habits, n (%) 0.912
Yes 28 (25.5) 13 (23.6) 15 (27.3)
No 82 (74.5) 42 (76.4) 40 (72.7)
Weight-bearing activity, n (%) 0.619
Yes 105 (95.5) 53 (96.4) 52 (94.5)
No 5 (4.5) 2 (3.6) 3 (5.5)
Fetal head circumference, mm 0.159
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 33.15 ± 0.62 33.18 ± 0.50 33.13 ± 0.72
Min–Max 32.0–38.0 32.0–35.5 32–28
Median (IQR) 33 (0) 33 (0) 33 (0)
Supraumbilical IRD, cm§ 0.920
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 1.41 ± 1.27 1.26 ± 1.13 1.56 ± 1.39
Min–Max 0–7 0–3 0–7
Median (IQR) 1.5 (2.0) 1.0 (2.0) 1.5 (3.0)
IRD at the horizontal line of umbilicus, cm 0.051
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 2.84 ± 0.80 2.74 ± 0.75 2.94 ± 0.85
Min–Max 1.0–7.0 1.5–5.0 1.0–7.0
Median (IQR) 3.0 (0.5) 3.0 (1.0) 3.0 (0.5)
IRD at the midpoint of the umbilical and pubic symphysis line, cm 0.654
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 0.18 ± 0.59 0.18 ± 0.62 0.18 ± 0.57
Min–Max 0–3 0–3 0–3
Median (IQR) 0 (0) 0 (0) 0 (0)
Time to pregnancy, weeks 0.524
N (Nmiss) 109 (1) 55 (0) 55 (0)
Mean±SD 38.87 ± 1.31 38.85 ± 1.38 54.85 ± 6.67
Min–Max 34–42 34–42 42–75
Median (IQR) 39 (2) 39 (2) 55 (10)
Time to postpartum, days 0.875
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 116.98 ± 78.05 118.07 ± 78.83 115.89 ± 77.97
Min–Max 43–363 43–346 43–363
Median (IQR) 87.0 (83.8) 87.0 (77.0) 88 (88)
Educational level, n (%) 0.161
Primary education or less 5 (4.5) 4 (7.3) 1 (1.8)
Secondary education 9 (8.2) 6 (10.9) 3 (5.5)
Tertiary education 96 (87.3) 45 (81.8) 51 (92.7)
Occupation before this pregnancy, n (%) 0.797
Yes (including the women who were on sick leave) 107 (97.3) 54 (98.2) 53 (96.4)
No (homemaker, job seeker or student) 3 (2.7) 1 (1.8) 2 (3.6)
Low back pain, n (%) 0.068
Yes 94 (85.5) 46 (83.6) 48 (87.3)
No 16 (14.5) 9 (16.4) 7 (12.7)
Pelvic girdle pain, n (%) 109 (1) 55 (0) 54 (1) 0.792
Yes 59 (53.6) 26 (47.3) 33 (60.0)
No 50 (45.5) 29 (52.7) 21 (38.2)
Urine leakage, n (%) 0.248
Yes 59 (53.6) 28 (50.9) 31 (56.4)
No 51 (46.4) 27 (49.1) 24 (43.6)
Urinary frequency, n (%) 0.061
Yes 49 (44.5) 21 (38.2) 28 (50.9)
No 61 (55.5) 34 (61.8) 27 (49.1)
Sexual dysfunction, n (%) 0.487
Yes 34 (30.9) 15 (27.3) 19 (34.5)
No 76 (69.1) 40 (72.7) 36 (65.5)
Chronic pelvic pain, n (%) 0.548
Yes 10 (9.1) 5 (9.1) 5 (9.1)
No 100 (90.9) 50 (90.9) 50 (90.9)
Constipation, n (%) 0.847
Yes 54 (49.1) 28 (50.9) 26 (47.3)
No 56 (50.9) 27 (49.1) 29 (52.7)
Urinary urgency, n (%) 0.098
Yes 27 (24.5) 16 (29.1) 11 (20.0)
No 83 (75.5) 39 (70.9) 44 (80.0)
Pelvic organ prolapses, n (%) 0.467
1 42 (38.2) 21 (38.2) 21 (38.2)
2 65 (59.1) 34 (61.8) 31 (56.4)
3 3 (2.7) 0 3 (5.5)
Supraumbilical AC at supine position, cm§ 0.645
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 79.64 ± 6.30 78.27 ± 5.45 81.0 ± 6.82
Min–Max 64.0–97.5 66.0–95.5 64.0–97.5
Median (IQR) 79.5 (6.0) 79.0 (4.5) 81.0 (8.7)
AC at the horizontal line of umbilicus in supine position, cm 0.927
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 83.16 ± 6.93 81.56 ± 6.26 84.77 ± 7.24
Min–Max 66.5–102.8 68.0–96.0 66.5–102.8
Median (IQR) 83.0 (7.8) 82.8 (6.5) 85.5 (9.8)
AC at the midpoint of the umbilical and pubic symphysis line in supine position, cm 0.726
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 85.39 ± 6.47 83.80 ± 5.59 86.97 ± 6.93
Min–Max 70–105 72–101 70–105
Median (IQR) 85.5 (6.9) 84.3 (6.8) 86.0 (9.0)
HC at supine position, cm 0.876
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 91.42 ± 5.58 90.06 ± 5.10 92.78 ± 5.76
MinMax 78.0106.5 78.0104.7 81.0106.5
Median (IQR) 91.0 (6.63) 90.0 (5.5) 93.5 (6.5)
Supraumbilical AC at standing position, cm§ 0.261
N (Nmiss) 85 (25) 44 (11) 41 (14)
Mean±SD 78.44 ± 6.68 77.28 ± 6.08 79.67 ± 7.14
MinMax 64.096.5 64.094.8 65.096.5
Median (IQR) 77.5 (7.9) 77.0 (7.9) 79.0 (8.85)
AC at the horizontal line of umbilicus in standing position, cm 0.509
N (Nmiss) 85 (25) 44 (11) 41 (14)
Mean±SD 88.38 ± 7.45 87.25 ± 7.14 89.60 ± 7.67
MinMax 70109 70103 71109
Median (IQR) 88.0 (9.1) 88.0 (7.8) 89.0 (10.8)
AC at the midpoint of the umbilical and pubic symphysis line in standing position, cm 0.717
N (Nmiss) 85 (25) 44 (11) 41 (14)
Mean±SD 91.91 ± 6.35 90.43 ± 5.52 93.50 ± 6.84
MinMax 75.0110.5 79.5106.0 75.0110.5
Median (IQR) 92.0 (7.5) 90.3 (6.7) 93.5 (8.9)
HC at standing position, cm 0.086
N (Nmiss) 84 (26) 44 (11) 40 (15)
Mean±SD 93.36 ± 6.06 91.82 ± 5.90 95.07 ± 5.84
MinMax 78.0111.5 78.0105.5 84.0111.5
Median (IQR) 93.5 (7.8) 92.3 (6.9) 95.3 (7.3)
Abdominal static endurance, s 0.902
N (Nmiss) 76 (34) 41 (14) 35 (20)
Mean±SD 8.49 ± 22.16 9.95 ± 26.84 6.77 ± 15.17
MinMax 0150 0150 071
Median (IQR) 0 (4.5) 0 (3) 0 (10)
Abdominal dynamic endurance 0.062
N (Nmiss) 74 (36) 40 (15) 34 (21)
Mean±SD 3.31 ± 7.03 3.00 ± 6.34 3.68 ± 7.84
Min–Max 0–28 0–22 0–28
Median (IQR) 0 (0) 0 (0) 0 (1.75)
Left side of umbilics skinfold thickness, mm 0.667
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 40.48 ± 14.93 39.42 ± 15.30 41.55 ± 14.61
Min–Max 10–90 11–90 10–74
Median (IQR) 39.5 (20.0) 36 (23) 40 (20)
Right side of umbilics skinfold thickness, mm 0.974
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 41.84 ± 14.79 40.02 ± 15.45 43.65 ± 14.0
Min–Max 11–90 11–90 13–73
Median (IQR) 41.5 (19.3) 37 (17) 44 (17)
Right skinfold thickness of triceps brachii, mm 0.347
N (Nmiss) 81 (29) 42 (13) 39 (16)
Mean±SD 37.67 ± 9.38 39.21 ± 10.50 36.0 ± 7.79
Min–Max 15–65 15–65 15–52
Median (IQR) 38.0 (13.0) 40.0 (16.3) 37.0 (9.0)
Right skinfold thickness of scapula, mm 0.219
N (Nmiss) 81 (29) 42 (13) 39 (16)
Mean±SD 36.07 ± 10.30 36.93 ± 10.44 35.15 ± 10.21
Min–Max 15–62 20–62 15–60
Median (IQR) 35.0 (14.5) 35.5 (15.3) 34.0 (14.0)
IRD at the midpoint of umbilicus and xiphoid process in the resting state, cmΔ 0.445
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 22.21 ± 10.83 20.60 ± 7.38 23.81 ± 13.31
Min–Max 7–97 10–36 7–97
Median (IQR) 21 (12) 20 (12) 23 (12)
IRD at the midpoint of umbilicus and xiphoid process in head-up and flexed knee state, cmΔ 0.544
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 18.13 ± 9.67 17.32 ± 6.88 18.95 ± 11.84
Min–Max 4–90 5–34 4–90
Median (IQR) 17 (10) 17 (9) 16 (11)
IRD at the midpoint of umbilicus and xiphoid process in end-expiratory state, cmΔ 0.288
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 23.88 ± 11.84 21.95 ± 8.00 25.81 ± 14.55
Min–Max 7–104 10–40 7–104
Median (IQR) 22 (14) 22 (13) 24 (15)
IRD at the horizontal line of umbilicus in the resting state, cmΔ 0.749
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 36.57 ± 13.73 34.88 ± 9.78 38.26 ± 16.70
Min–Max 21–114 21–69 21–114
Median (IQR) 34 (14) 34 (12) 34 (16)
IRD at the horizontal line of umbilicus in head-up and flexed knee state, cmΔ 0.540
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 26.94 ± 9.75 26.06 ± 8.67 27.83 ± 10.73
Min–Max 10–80 14–65 10–80
Median (IQR) 25.0 (9.3) 25 (9) 25 (9)
IRD at the horizontal line of umbilicus in end-expiratory state, cmΔ 0.708
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 38.38 ± 14.69 36.49 ± 11.04 40.27 ± 17.50
Min–Max 21–118 21–72 22–118
Median (IQR) 35 (14) 35 (13) 28 (16)
IRD at the midpoint of between umbilicus and pubic symphysis, cmΔ
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 0 0 0
Min–Max 0 0 0
Median (IQR) 0 (0) 0 (0) 0 (0)
Left abdominal skinfold, mmΔ 0.454
N (Nmiss) 15 (95) 4 (51) 11 (44)
Mean±SD 20.47 ± 4.44 20.25 ± 1.50 20.55 ± 5.18
Min–Max 14–30 19–22 14–30
Median (IQR) 20.0 (6.0) 20.0 (2.8) 20 (8)
Right abdominal skinfold, mmΔ 0.260
N (Nmiss) 15 (95) 4 (51) 11 (44)
Mean±SD 19.93 ± 3.58 19.75 ± 0.96 20.0 ± 4.20
Min–Max 15–26 19–21 15–26
Median (IQR) 19.0 (7.0) 19.5 (1.8) 19 (8)
The mean values of pre-baseline at the period of calm 0.043
N (Nmiss) 109 (1) 55 (0) 54 (1)
Mean±SD 7.10 ± 3.91 7.02 ± 4.43 7.18 ± 3.35
Min–Max 0.58–23.16 1.14–23.16 0.28–14.91
Median (IQR) 6.2 (5.1) 5.7 (5.8) 6.81 (4.54)
The mean values of fast muscle at the period of systolic 0.427
N (Nmiss) 109 (1) 55 (0) 54 (1)
Mean±SD 27.88 ± 11.42 28.55 ± 10.37 27.20 ± 12.46
Min–Max 5.09–49.61 9.12–48.83 5.09–49.61
Median (IQR) 28.2 (18.2) 28.5 (17.8) 27.1 (20.66)
The mean values of comprehensive muscle at the period of systolic 0.005
N (Nmiss) 109 (1) 55 (0) 54 (1)
Mean±SD 20.74 ± 10.74 20.48 ± 10.20 21.01 ± 11.35
Min–Max 3.16–43.76 3.19–40.84 3.16–43.76
Median (IQR) 18.6 (17.2) 18.2 (17.1) 18.7 (18.42)
The mean values of slow muscle at the period of systolic 0.001
N (Nmiss) 109 (1) 55 (0) 54 (1)
Mean±SD 18.13 ± 9.72 17.40 ± 9.06 18.87 ± 10.39
Min–Max 2.8540.50 2.8540.50 4.1238.97
Median (IQR) 16.4 (14.2) 16.1 (13.3) 16.61 (15.77)
The mean values of post-baseline at the period of calm 0.225
N (Nmiss) 109 (1) 55 (0) 54 (1)
Mean±SD 6.47 ± 3.78 6.24 ± 3.66 6.70 ± 3.69
Min–Max 0.5819.12 1.2119.12 0.5816.52
Median (IQR) 6.5 (5.2) 5.8 (4.3) 6.6 (4.9)
Leeds dyspepsia questionnaire 0.716
N (Nmiss) 110 55 55
Mean±SD 6.55 ± 1.22 6.49 ± 1.09 6.60 ± 1.34
Min–Max 613 612 613
Median (IQR) 6.0 (0.25) 6.5 (0) 6.0 (1)
SAT in the paraumbilical region 0.069
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 41.16 ± 14.84 39.38 ± 15.38 43.01 ± 14.09
Min–Max 1090 1190 1074
Median (IQR) 40 (20) 36 (20) 43 (18.5)
SAT in right triceps region 0.124
N (Nmiss) 81 (29) 41 (14) 40 (15)
Mean±SD 37.67 ± 9.38 39.21 ± 10.50 36 ± 7.79
Min–Max 1565 1565 1552
Median (IQR) 38 (13) 40 (16.25) 37 (9)
SAT in the right subscapular region 0.442
N (Nmiss) 81 (29) 41 (14) 40 (15)
Mean±SD 36.07 ± 10.31 36.93 ± 10.44 35.15 ± 10.21
Min–Max 1562 2062 1560
Median (IQR) 35 (14.5) 35.5 (15.25) 34 (14)
F% 0.380
N (Nmiss) 110 (0) 55 (0) 55 (0)
Mean±SD 0.32 ± 0.20 0.34 ± 0.21 0.30 ± 0.19
Min–Max 0.020.73 0.020.73 0.020.62
Median (IQR) 0.37 (0.44) 0.39 (0.40) 0.35 (0.41)

AC, abdominal circumference; EA, electroacupuncture; BMI, body mass index; SD, Standard Deviation; HC, hip circumference; IQR, Inter-Quartile Range; IRD, inter recti distance.

*

The only one patient (1 [who withdrew with low back pain] in control group) did not receive the study consecutive treatment. The follow-up to 26 weeks was incomplete for 3 patients (Due to the COVID-19, there is no way to follow up on time in other places).

There were no significant differences between two groups.

The pelvic girdle includes inguinal, pubic symphysis, coccyx, sacrum, and either side of the pelvis.

§

The midpoint of umbilicus and xiphoid process.

Δ

At the supine position.