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Table 2 IGF-1 levels (ng/ml) for women aged 18 to 21 years and women aged 31 to 40 years according to different characteristics.

From: A cross-sectional study of different patterns of oral contraceptive use among premenopausal women and circulating IGF-1: implications for disease risk

  Ages 18 to 21 (n = 180)   Ages 31 to 40 (n = 148)
  No. Mean (SD) P*   No. Mean (SD) P*
Age    0.002     0.76
18 32 366.9 (121.5)   31 to 35 81 175.7 (61.0)  
19 to 21 148 304.3 (96.9)   36 to 40 67 172.8 (51.4)  
BMI (kg/m2)    0.36     0.12
< 20.0 33 312.1 (93.8)   < 25.0 82 178.8 (55.2)  
20.0 - 24.9 107 323.6 (109.3)   25.0 - 29.9 41 178.8 (62.7)  
25.0 40 296.3 (97.4)  30.0 25 152.9 (47.9)  
Height (cm)    0.67     0.92
158.5 52 311.3 (109.8)  159.5 39 176.2 (61.8)  
158.6 - 162.4 42 322.6 (101.2)   159.6 - 163.0 46 174.6 (56.8)  
162.5 - 167.4 43 327.2 (102.6)   163.1 - 167.0 35 168.9 (46.7)  
167.5 43 301.7 (103.1)  167.1 28 178.5 (63.0)  
Weight (kg)    0.14     0.02
53.5 44 316.3 (101.6)  57.9 35 170.4 (48.8)  
53.6 - 59.3 47 301.1 (95.6)   58.0 - 64.4 37 186.7 (62.0)  
59.4 - 66.3 45 344.6 (122.2)   64.5 - 73.4 40 186.7 (52.5)  
66.4 44 300.0 (91.6)  73.5 36 152.1 (57.6)  
Ethnicity    0.08     0.90
European 69 327.2 (112.8)   European 96 172.7 (54.6)  
East Asian 56 304.3 (108.6)   East Asian 11 186.1 (84.7)  
South Asian 17 357.9 (92.9)   South Asian 7 171.4 (50.0)  
Other/Mixed a 37 288.8 (76.4)   Other/Mixed a 34 176.2 (55.3)  
Parity        0.49
Nulliparous 180 -   Nulliparous 112 176.3 (57.5)  
Parous 0 -   Parous 36 168.7 (54.7)  
Physical Activityb        
Childhood    0.29     0.17
Never 11 283.3 (81.5)   Never 22 159.1 (64.0)  
Ever 169 317.5 (105.3)   Ever 126 177.1 (55.2)  
Teenager    0.68     0.98
Never 31 322.4 (103.1)   Never 31 174.2 (60.6)  
Ever 149 314.0 (104.6)   Ever 117 174.5 (55.9)  
Current    0.78     0.04
Never 50 319.2 (116.6)   Never 23 151.9 (60.8)  
Ever 129 314.3 (99.7)   Ever 125 178.6 (55.2)  
Days since last period    0.77     0.02
14 72 312.6 (100.9)  14 66 162.1 (50.7)  
>14 108 317.3 (106.7)   > 14 82 184.4 (59.6)  
  1. * Results of t-test, one-way ANOVA (where applicable); a Includes African, Caribbean, Middle Eastern, First Nation, Latin American; b Doing physical activity at least once per week