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Table 1 Comparison of the 6-year cohort and the baseline study population, Espoo, Finland 1991–1997.

From: Breastfeeding and childhood asthma: a six-year population-based cohort study

  Baseline Lost to follow-up 6-year-cohort
Characteristics at baseline N % N % N %
Number 2568 100 584 22.7 1984 77.3
Age (years)       
   1 424 16.5 100 17.1 324 16.3
   2 405 15.8 104 17.8 301 15.2
   3 310 16.0 92 15.8 318 16.0
   4 400 15.6 67 11.5 333 16.8
   5 415 16.2 101 17.3 314 15.8
   6 391 15.2 81 13.9 310 15.6
   7- 123 4.8 39 6.7 84 4.2
Gender       
   Boy 1310 51.0 309 52.9 1001 50.5
   Girl 1258 49.0 275 47.1 983 49.5
Any allergic disease       
   Yes 337 13.1 81 13.9 256 12.9
   No 2231 86.9 503 86.1 1728 87.1
Single parent/guardian       
   Yes 183 7.1 53 9.1 130 6.6
   No 2385 92.9 531 90.9 1854 93.4
Highest level of parental education       
   Non-professional 498 19.5 129 22.3 369 18.7
   Trade school 663 25.9 140 24.2 523 26.5
   College or university 1395 54.6 310 53.5 1085 54.9
   Missing information 12      
Exposure to ETS       
   Yes 267 10.4 76 13.1 191 9.7
   No 2291 89.6 504 86.9 1787 90.3
   Missing Information 10      
Gas stove       
   Yes 86 3.4 24 4.1 62 3.1
   No 2469 96.6 556 95.9 1913 96.9
   Missing Information 13      
Hairy/Feathery Pets       
   Yes 480 18.7 113 19.3 367 18.5
   No 2088 81.3 471 80.7 1617 81.5
Type of day care       
   100% Home 940 36.6 210 36.0 730 36.8
   100% Family 513 20.0 119 20.4 394 19.9
   100% Centre 252 9.8 56 9.6 196 9.9
   Combinations 863 33.6 199 34.1 664 33.5
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