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Table 6 Odd ratios (OR) and 95% confidence intervals (CI) from a fully saturated discrete-time logistic regression model examining the risk for a subsequent cancer diagnosis within the cohorts with a primary cutaneous malignant melanoma (CMM) or squamous cell carcinoma (SCC)

From: New malignancies after squamous cell carcinoma and melanomas: a population-based study from Norway

  CMM SCC
  Events/Pyr1 OR (95% CI) Events/Pyr OR (95% CI)
Sex     
 Female 2058/173 679 1.00 ref 1893/81 108 1.00 ref
 Male 1938/115 144 1.51 (1.41,1.63) 3719/94 533 1.90 (1.79,2.01)
Age 2     
 < 40 years 80/31 862 1.00 ref 19/3020 1.00 ref
 40-59 years 807/106 669 2.89 (2.29,3.65) 222//17 362 2.28 (1.42,3.66)
 ≥ 60 years 3109/147 183 6.67 (5.31,8.39) 5371/155 259 4.62 (2.93,7.29)
Residential region 3     
 North 275/23 927 1.00 ref 419/15 325 1.00 ref
 Mid 703/54 955 1.09 (0.95,1.26) 1124/37 786 1.09 (0.98,1.23)
 South 3018/209 941 1.20 (1.06,1.36) 4069/122 530 1.20 (1.08,1.33)
Calendar period 2     
 < 1965 6/2959 1.00 ref 35/4411 1.00 ref
 1965-1974 71/13 448 3.01 (1.30,6.98) 168/10 542 2.51 (1.73,3.64)
 1975-1984 276/34 380 4.92 (2.15,11.24) 438/22 580 3.61 (2.50,5.20)
 1985-1994 913/69 763 7.80 (3.43,17.34) 1281/40 225 6.46 (4.52,9.24)
 1995-2004 1707/112 983 8.88 (3.91,20.17) 2364/64 765 7.76 (5.44,11.1)
 ≥ 2004 1023/55 290 10.52 (4.63,23.9) 1326/33 118 8.73 (6.10,12.5)
Educational level 4     
 ≤ Primary 63/5193 1.00 ref 178/6203 1.00 ref
 Secondary 1285/85 407 0.80 (0.61,1.04) 2514/82 333 0.60 (0.50,0.71)
 Some college 1293/85 733 0.79 (0.60,1.05) 1577/46 489 0.60 (0.50,0.72)
 ≥ College degree 1355/112 490 0.80 (0.61,1.05) 1343/40 616 0.61 (0.51,0.74)
Marital status 3     
 Not married 1089/84 671 1.00 ref 2161/72 265 1.00 ref
 Married 2907/204 152 1.02 (0.94,1.10) 3451/103 376 1.01 (0.95,1.08)
Parental status 4     
 No children 881/68 530 1.00 ref 1692/56 884 1.00 ref
 Children 3115/220 293 0.91 (0.84,0.99) 3920/118 757 0.93 (0.87,0.99)
Income (annual) 3     
 $ 05 1586/81 524 1.00 ref 3982/113 773 1.00 ref
 $ 80–9 999 679/57 594 0.83 (0.75,0.91) 715/24 518 0.85 (0.78,0.92)
 $ 10 000–19 999 514/50 340 0.68 (0.61,0.75) 300/12 099 0.76 (0.67,0.85)
 $ 20 000–39 999 713/57 131 0.75 (0.68,0.82) 334/13 692 0.65 (0.58,0.74)
 $ ≥ 40 000 504/42 234 0.65 (0.58,0.73) 281/11 559 0.59 (0.51,0.67)
  1. 1Number of events (new cancers) per person-year during follow-up. 2Time-varying covariates (yearly). 3At start of follow-up. 4At end of follow-up. 5Includes also those with missing income data.