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Table 2 Baseline characteristics of all participants and by intervention groups

From: Fatty fish intake and attention performance in 14–15 year old adolescents: FINS-TEENS - a randomized controlled trial

Variables N All (n = 426) Fish (n = 137) Meat (n = 148) Supplement (n = 141) P-value a
Sex n (%) 426      0.512
 Male   204 (47.9) 61 (44.5) 76 (51.4) 67 (47.5)  
 Female   222 (52.1) 76 (55.5 72 (51.4) 74 (52.5)  
Age (years) mean ± SD)) 426 14.6 ± 0.3 14.6 ± 0.3 14.6 ± 0.3 14.6 ± 0.3 0.718
BMI categoryb (kg/m2) 396      0.250
 Underweight n (%)   53 (12.4) 21 (16.5) 18 (13.2) 14 (10.5)  
 Overweight n (%)   21 (4.9) 4 (3.1) 10 (7.4) 7 (5.3)  
 Obese n (%)   7 (1.6) 3 (2.4) 0 (0) 4 (3.0)  
Parental education level n (%) 351      0.468
 Elementary/vocational school   138 (39.3) 45 (40.5) 51 (42.5) 42 (35.0)  
 College/university   213 (60.7) 66 (59.5) 69 (57.5) 78 (65.0)  
Family income in NOKc n (%) 348      0.421
 <200,000–749,999   74 (21.3) 21 (19.1) 21 (17.6) 32 (26.9)  
 750,000–1,249,999   178 (51.1) 57 (51.8) 66 (55.5) 55 (46.2)  
 1,250,000- > 2,000,000   96 (27.6) 32 (29.1) 32 (26.9) 32 (26.9)  
Immigrantd n (%) 351 8 (2.3) 2 (1.8) 2 (1.7) 4 (3.3) 0.633
Fish oil supplementse (n (%)) 423      0.719
 Never   228 (53.9) 66 (48.2) 81 (55.5) 81 (57.9)  
 1–3 times/month   54 (12.8) 18 (13.1) 19 (13.0) 17 (12.1)  
 1–3 times/week   47 (11.1) 21 (15.3) 14 (9.6) 12 (8.6)  
 4–6 times/week   21 (5.0) 7 (5.1) 6 (4.1) 8 (5.7)  
 Every day   73 (17.3) 25 (18.2) 26 (17.8) 22 (15.7)  
  1. Data are given as mean ± SD or n (%). Abbreviations: SD Standard deviation, NOK Norwegian kroner
  2. a One-way ANOVA test (continuous variables) and Pearson’s Chi-square test (X 2) (categorical variables) for comparison between treatment groups
  3. bCole’s age and sex-specific BMI cut off points for underweight [25], and overweight and obesity [26] for adolescents age 14.5 years
  4. c 100 NOK = approximately 10€/11$
  5. d Immigrant was defined as participants who’s both parents and themselves were born outside Norway
  6. e N (%) of participants reporting to consume fish oil as dietary supplements