Predictors of Postpartum Glucose Tolerance Testing in Italian Women with Gestational Diabetes Mellitus
Table 3
(a) Multiple logistic regression analysis for predicting follow-up adherence among Italian women with GDM. (b) Effects of continuous clinical and biochemical traits on follow-up adherence.
(a)
Followup ( = 374)
No followup ( = 785)
OR 1 (95% CI)
value 1
Statistical power
OR 2 (95% CI)
value 2
Age (≥31 yr versus ≤30 yr)
69 versus 305
174 versus 611
1.18 (0.89–1.58)
0.242
22.1%
1.27 (0.88–1.82)
0.198
Familiarity for type 2 DM (%)
270 (72.2)
535 (68.2)
1.21 (0.92–1.58)
0.178
31.6%
0.94 (0.68–1.31)
0.097
Prepregnancy BMI (kg/m2)
<25 versus ≥25
174 versus 200
426 versus 359
1.41 (1.09–1.81)
0.008
81.5%
1.74 (1.27–2.37)
0.001
Previous GDM (%)
72 (19.3)
45 (5.7)
4.82 (3.17–7.33)
<0.001
>95.0%
5.30 (3.26–8.61)
<0.001
Parity (1 versus ≥2)
167 versus 207
346 versus 439
1.03 (0.80–1.32)
0.800
5.7%
1.11 (0.82–1.51)
0.500
Educational status
Middle/high versus low
303 versus 71
401 versus 384
4.06 (3.02–5.45)
<0.001
>95.0%
3.54 (2.48–5.06)
<0.001
Insulin treatment (%)
147 (39.3)
253 (32.2)
2.32 (1.76–3.05)
<0.001
>95.0%
2.63 (1.90–3.66)
<0.001
PCOS (%)
72 (19.3)
37 (4.7)
5.27 (3.36–8.27)
<0.001
>95.0%
5.36 (3.24–8.85)
<0.001
OR 1: odd ratio after adjustment for any possible confounder; OR 2: As OR 1, but after stratification for absence of counseling; CI: confidence interval; Post-hoc statistical power calculations were performed using G*Power software 3.1, entering -squared multiple correlation coefficient obtained with regression for each trait. Low educational status: primary school; middle educational status: secondary school; high educational status: university degree; PCOS: polycystic ovary syndrome.
(b)
Followup (= 374)
No followup ( = 785)
value
Statistical power
Age (yr), mean ± SD
34.5 ± 5.2
33.1 ± 4.8
<0.001
>95.0%
Prepregnancy BMI (kg/m2), mean ± SD
25.9 ± 4.5
25.7 ± 4.7
0.265
67.4%
FPG (mg/dL), mean ± SD
92.8 ± 9.0
91.2 ± 10.7
0.027
>95.0%
Week at diagnosis (), mean ± SD
25.3 ± 4.9
27.2 ± 3.4
<0.001
>95.0%
Continuous variables were compared using linear regression models adjusted for familial history of type 2 DM, parity, and prepregnancy BMI (when appropriate). Post-hoc statistical power calculations were performed using G*Power software 3.1, entering partial -squared obtained with regression for each trait. FPG: fasting plasma glucose; PCOS: polycystic ovary syndrome. All variables have been log-transformed to better approximate a normal distribution.
