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Table 2—

Annual number of singleton births, mean maternal age, and prevalence of GDM per 100 births by maternal age and race/ethnicity among 199,298 births screened for GDM, Kaiser Permanente Southern California, 1999–2005

1999200020012002200320042005*Ptrend
No. births 30,576 29,903 28,474 28,443 28,308 26,815 26,779  
Mean age (years) 28.1 28.4 28.6 28.8 29.0 29.1 29.2  
No. with GDM 2,171 2,205 2,219 2,329 2,091 2,028 2,078  
    13–19 years 1.8 (0.27) 1.4 (0.25) 2.0 (0.32) 1.3 (0.27) 1.4 (0.29) 2.2 (0.36) 1.7 (0.31) 0.7539 
    20–24 years 3.3 (0.23) 3.4 (0.24) 4.3 (0.27) 3.7 (0.26) 3.3 (0.25) 3.3 (0.27) 3.7 (0.29) 0.6778 
    25–29 years 6.0 (0.25) 6.5 (0.26) 6.4 (0.27) 6.8 (0.27) 5.6 (0.25) 6.2 (0.27) 6.1 (0.27) 0.4686 
    30–34 years 8.9 (0.32) 9.1 (0.32) 9.5 (0.34) 10.2 (0.34) 9.4 (0.33) 8.5 (0.32) 9.0 (0.32) 0.6606 
    35–49 years 13.0 (0.53) 13.4 (0.54) 13.2 (0.54) 13.5 (0.54) 12.2 (0.51) 12.8 (0.52) 12.8 (0.52) 0.3787 
    ≥40 years 17.4 (1.27) 15.5 (1.22) 16.2 (1.19) 17.6 (1.18) 15.9 (1.13) 17.0 (1.21) 17.1 (1.17) 0.8138 
Race/ethnicity         
    Non-Hispanic white         
        Crude 5.2 (0.24) 5.2 (0.25) 5.9 (0.27) 6.3 (0.28) 5.4 (0.27) 5.4 (0.27) 5.3 (0.28) 0.9306 
        Age-adjusted 5.1 (0.05) 5.0 (0.05) 5.6 (0.05) 5.9 (0.05) 5.2 (0.05) 5.0 (0.05) 4.9 (0.05) 0.4767 
    Hispanic         
        Crude 7.6 (0.21) 7.8 (0.22) 8.3 (0.23) 8.6 (0.23) 7.8 (0.22) 8.0 (0.23) 8.5 (0.23) 0.0506 
        Age-adjusted 8.6 (0.06) 8.6 (0.06) 8.9 (0.07) 9.0 (0.07) 8.1 (0.06) 8.2 (0.06) 8.6 (0.06) 0.2552 
    Black         
        Crude 5.6 (0.41) 6.2 (0.44) 6.1 (0.44) 6.9 (0.48) 4.6 (0.41) 5.9 (0.47) 5.0 (0.44) 0.1120 
        Age-adjusted 6.0 (0.05) 6.6 (0.06) 6.5 (0.06) 7.1 (0.06) 4.6 (0.05) 6.2 (0.05) 5.2 (0.05) 0.0297 
    Asian/Pacific Islander         
        Crude 11.3 (0.57) 12.0 (0.57) 11.7 (0.58) 11.7 (0.57) 12.5 (0.57) 12.0 (0.57) 11.8 (0.57) 0.4782 
        Age-adjusted 10.2 (0.07) 10.8 (0.07) 10.5 (0.07) 10.2 (0.07) 10.9 (0.07) 10.8 (0.07) 10.3 (0.07) 0.5923 
    Other races         
        Crude 5.6 (1.16) 6.5 (1.28) 6.0 (1.34) 8.3 (1.45) 4.3 (1.08) 7.4 (1.40) 8.1 (1.14) 0.2005 
        Age-adjusted 6.1 (0.05) 7.2 (0.06) 6.4 (0.06) 9.5 (0.07) 4.6 (0.05) 7.6 (0.06) 8.5 (0.06) 0.3224 
All women         
    Crude 7.1 (0.15) 7.4 (0.15) 7.8 (0.16) 8.2 (0.16) 7.4 (0.16) 7.6 (0.16) 7.8 (0.16) 0.0176 
    Age-adjusted 7.4 (0.06) 7.6 (0.06) 7.9 (0.06) 8.1 (0.06) 7.2 (0.06) 7.4 (0.06) 7.5 (0.06) 0.4104 
Age- and race/ethnicity-adjusted 7.5 (0.06) 7.6 (0.06) 7.9 (0.06) 8.1 (0.06) 7.2 (0.06) 7.3 (0.06) 7.4 (0.06) 0.0655 
1999200020012002200320042005*Ptrend
No. births 30,576 29,903 28,474 28,443 28,308 26,815 26,779  
Mean age (years) 28.1 28.4 28.6 28.8 29.0 29.1 29.2  
No. with GDM 2,171 2,205 2,219 2,329 2,091 2,028 2,078  
    13–19 years 1.8 (0.27) 1.4 (0.25) 2.0 (0.32) 1.3 (0.27) 1.4 (0.29) 2.2 (0.36) 1.7 (0.31) 0.7539 
    20–24 years 3.3 (0.23) 3.4 (0.24) 4.3 (0.27) 3.7 (0.26) 3.3 (0.25) 3.3 (0.27) 3.7 (0.29) 0.6778 
    25–29 years 6.0 (0.25) 6.5 (0.26) 6.4 (0.27) 6.8 (0.27) 5.6 (0.25) 6.2 (0.27) 6.1 (0.27) 0.4686 
    30–34 years 8.9 (0.32) 9.1 (0.32) 9.5 (0.34) 10.2 (0.34) 9.4 (0.33) 8.5 (0.32) 9.0 (0.32) 0.6606 
    35–49 years 13.0 (0.53) 13.4 (0.54) 13.2 (0.54) 13.5 (0.54) 12.2 (0.51) 12.8 (0.52) 12.8 (0.52) 0.3787 
    ≥40 years 17.4 (1.27) 15.5 (1.22) 16.2 (1.19) 17.6 (1.18) 15.9 (1.13) 17.0 (1.21) 17.1 (1.17) 0.8138 
Race/ethnicity         
    Non-Hispanic white         
        Crude 5.2 (0.24) 5.2 (0.25) 5.9 (0.27) 6.3 (0.28) 5.4 (0.27) 5.4 (0.27) 5.3 (0.28) 0.9306 
        Age-adjusted 5.1 (0.05) 5.0 (0.05) 5.6 (0.05) 5.9 (0.05) 5.2 (0.05) 5.0 (0.05) 4.9 (0.05) 0.4767 
    Hispanic         
        Crude 7.6 (0.21) 7.8 (0.22) 8.3 (0.23) 8.6 (0.23) 7.8 (0.22) 8.0 (0.23) 8.5 (0.23) 0.0506 
        Age-adjusted 8.6 (0.06) 8.6 (0.06) 8.9 (0.07) 9.0 (0.07) 8.1 (0.06) 8.2 (0.06) 8.6 (0.06) 0.2552 
    Black         
        Crude 5.6 (0.41) 6.2 (0.44) 6.1 (0.44) 6.9 (0.48) 4.6 (0.41) 5.9 (0.47) 5.0 (0.44) 0.1120 
        Age-adjusted 6.0 (0.05) 6.6 (0.06) 6.5 (0.06) 7.1 (0.06) 4.6 (0.05) 6.2 (0.05) 5.2 (0.05) 0.0297 
    Asian/Pacific Islander         
        Crude 11.3 (0.57) 12.0 (0.57) 11.7 (0.58) 11.7 (0.57) 12.5 (0.57) 12.0 (0.57) 11.8 (0.57) 0.4782 
        Age-adjusted 10.2 (0.07) 10.8 (0.07) 10.5 (0.07) 10.2 (0.07) 10.9 (0.07) 10.8 (0.07) 10.3 (0.07) 0.5923 
    Other races         
        Crude 5.6 (1.16) 6.5 (1.28) 6.0 (1.34) 8.3 (1.45) 4.3 (1.08) 7.4 (1.40) 8.1 (1.14) 0.2005 
        Age-adjusted 6.1 (0.05) 7.2 (0.06) 6.4 (0.06) 9.5 (0.07) 4.6 (0.05) 7.6 (0.06) 8.5 (0.06) 0.3224 
All women         
    Crude 7.1 (0.15) 7.4 (0.15) 7.8 (0.16) 8.2 (0.16) 7.4 (0.16) 7.6 (0.16) 7.8 (0.16) 0.0176 
    Age-adjusted 7.4 (0.06) 7.6 (0.06) 7.9 (0.06) 8.1 (0.06) 7.2 (0.06) 7.4 (0.06) 7.5 (0.06) 0.4104 
Age- and race/ethnicity-adjusted 7.5 (0.06) 7.6 (0.06) 7.9 (0.06) 8.1 (0.06) 7.2 (0.06) 7.3 (0.06) 7.4 (0.06) 0.0655 

Data are prevalence per 100 (SEM).

*

P values derived from Poisson regression models using GDM as the outcome variable and year as a continuous variable in the model after adjustment for other variables specified for the row.

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