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Table 2 Baseline characteristics of the clusters in male population, Tehran Lipid and Glucose Study (1999–2014)

From: Sex-specific clustering of metabolic risk factors and cancer risk: a longitudinal study in Iran

VariablesCluster 1
(n = 674)
Cluster 2
(n = 411)
Cluster 3
(n = 498)
Cluster 4
(n = 672)
Cluster 5
(n = 456)
Cluster 6
(n = 375)
Cluster 7
(n = 843)
*P value
Age (years)53.5(12.4)52.3(13.1)52.4(14.2)51.0(13.4)42.4(9.8)40.8(9.3)43.6(11.5)< 0.001
Education
 Level 1 (0–8 years)520(77.2)324(78.8)373(74.9)507(75.4)354(77.6)291(77.6)634(75.2)< 0.001
 Level 2 (9–12 years)98(14.5)54(13.1)79(15.9)113(16.8)89(19.5)78(20.8)173(20.5)
 Level 3 (> 12 years)56(8.3)33(8.1)46(9.2)52(7.8)13(2.9)6(1.6)36(4.3)
Physical activity level
 Low physical activity490(72.7)287(69.8)326(65.5)498(74.1)343(75.2)279(74.4)627(74.4)0.005
Smoking
 Never291(43.2)173(42.1)207(41.6)296(44.0)161(35.3)134(35.7)256 (30.3)< 0.001
 Past133(19.7)77(18.7)89(17.9)125(18.6)68(14.9)48(12.8)111(13.2)
 Passive73 (10.8)50(12.2)59(11.8)102(15.2)66(14.5)57(15.2)95 (11.3)
 Current177(26.3)111(27.0)143(28.7)149(22.2)161(35.3)136(36.3)381(45.2) 
BMI (kg/m2)27.6(3.9)26.7(4.1)26.2(3.7)27.1(3.8)28.2(2.6)27.9(2.2)22.1(2.1)< 0.001
FPG (mmol/L)7.4(2.7)7.1(2.3)4.9(0.3)4.9(0.3)4.9(0.4)4.9(0.3)4.8(0.3)< 0.001
TC (mmol/L)6.2(0.8)4.4(0.5)4.4(0.5)6.1(0.8)6.0(0.8)4.4(0.5)4.9(1.0)< 0.001
SBP (mmHg)130.2(21.2)127.8(20.7)135.8(16.3)134.0(14.7)109.2(6.7)108.5(7.5)106.4(8.2)< 0.001
Mean number of risk factors3.4(0.7)2.2(0.7)1.6(0.5)2.7(0.5)2.0(0.0)1.0(0.0)0.4(0.4)< 0.001
HBMI511(75.8)277(67.4)302(60.6)486(72.3)456(100)375(100)0(0.0)< 0.001
HSBP450(66.8)256(62.3)498(100)672(100)0(0.0)0(0.0)0(0.0)< 0.001
HTC674(100)0 (0.0)0 (0.0)672 (100)456 (100)0(0.0)351(41.6)< 0.001
HFPG674(100)411(100)0(0.0)0(0.0)0(0.0)0(0.0)0(0.0)< 0.001
Number of events291630274818 
Incident rate of cancers (CI), per 1000 person years3.6(2.5–5.2)3.4(2.0–5.5)5.1(3.6–7.3)3.2(2.2–4.7)0.6(0.2–1.8)1.7(0.8–3.5)1.7(1.1–2.7) 
  1. Figures are presented as mean (standard deviation) for continuous variables, and number (percentage) for categorical variables
  2. CI confidence interval, HBMI high body mass index, HFPG high fasting plasma glucose, HTC high total cholesterol, HDL-C high systolic blood pressure
  3. *P values are based on ANOVA test for continuous variables and chi-square test for categorical variables