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Table 2 Crude associations of lumbar disc degeneration sum score with quartiles of on body mass index (BMI), weight, height, waist circumference and physical activity level, and pack-years of smoking

From: Body mass index is associated with lumbar disc degeneration in young Finnish males: subsample of Northern Finland birth cohort study 1986

Males Females
(N = 230) (N = 317)
BMI at 16 years (kg/m 2 ; quartiles)
I (15.6-19.0) 1.00 I (14.5-18.8) 1.00
II (19.1-20.6) 1.44 (0.74–2.81) II (18.9-20.2) 0.72 (0.39–1.30)
III (20.7-22.6) 1.67 (0.85–3.26) III (20.3-21.9) 1.04 (0.58–1.87)
IV (22.7-33.0) 2.64 (1.35–5.16) IV (22.0-35.8) 1.33 (0.75–2.38)
BMI at 19 years (kg/m 2 ; quartiles)
I (16.0-21.1) 1.00 I (15.8-19.7) 1.00
II (21.2-23.1) 1.54 (0.80–2.99) II (19.8-21.5) 0.93 (0.52–1.66)
III (23.2-25.6) 1.34 (0.69–2.61) III (21.6-23.4) 0.83 (0.47–1.49)
IV (25.7-38.1) 2.22 (1.14–4.33) IV (23.5-39.9) 1.09 (0.61–1.92)
Weight at 16 years (kg; quartiles)
I (45.2-57.2) 1.00 I (37.5-49.9) 1.00
II (57.3-63.5) 2.04 (1.04–4.03) II (50.0-54.0) 0.88 (0.48–1.61)
III (63.6-72.2) 2.18 (1.10–4.32) III (54.1-60.3) 1.30 (0.72–2.34)
IV (72.3-112.1) 4.00 (2.01–7.96) IV (60.4-94.0) 1.57 (0.88–2.81)
Weight 19 years (kg: quartiles)
I (52.5-66.9) 1.00 I (39.9-52.9) 1.00
II (67.0-73.4) 1.19 (0.61–2.32) II (53.0-57.8) 1.24 (0.69–2.23)
III (73.5-81.5) 1.77 (0.91–3.44) III (57.9-64.2) 1.23 (0.69–2.21)
IV (81.6-123.6) 2.72 (1.39–5.32) IV (64.3-114.1) 1.42 (0.79–2.54)
Height at 16 years (cm; quartiles)
I (158.2-171.3) 1.00 I (134.7-160.9) 1.00
II (171.4-174.9) 2.03 (1.02–4.04) II (161.0-164.1) 1.28 (0.70–2.35)
III (175.0-179.8) 1.97 (1.01–3.84) III (164.2-168.0) 1.68 (0.93–3.05)
IV (179.9-196.2) 3.39 (1.72–6.70) IV (168.1-179.2) 1.81 (1.00–3.29)
Height 19 years (cm; quartiles)
I (158.5-173.9) 1.00 I (145.0-160.9) 1.00
II (174.0-177.9) 1.01 (0.52–1.96) II (161.0-164.4) 1.06 (0.58–1.93)
III (178.0-182.9) 1.31 (0.68–2.50) III (164.5-167.9) 1.89 (1.04–3.42)
IV (183.0-201.0) 2.28 (1.16–4.46) IV (168.0-179.0) 1.77 (0.98–3-18)
Waist circumference at 16 years (cm; quartiles)
I (62.5-70.4) 1.00 I (59.5-65.9) 1.00
II (70.5-74.0) 1.02 (0.52–2.01) II (66.0-69.0) 0.78 (0.43–1.42)
III (74.1-79.0) 1.67 (0.85–3.28) III (69.1-73.4) 0.98 (0.54–1.78)
IV (79.1-108.1) 3.11 (1.58–6.15) IV (73.5-100.5) 1.24 (0.69–2.22)
Waist circumference at 19 years (cm; quartiles)
I (62.5-75.9) 1.00 I (59.0-66.9) 1.00
II (76.0-79.0) 1.29 (0.66–2.51) II (67.0-70.0) 0.86 (0.48–1.52)
III (79.1-85.9) 1.50 (0.78–2.89) III (70.1-75.0) 1.02 (0.57–1.85)
IV (86.0-121.0) 2.38 (1.23–4.62) IV (75.1-118.5) 0.85 (0.47–1.53)
Physical activity level # (MET hours/week; quartiles)
I (4.0-23.9) 1.00 (0.52–1.92) I (2.8-20.0) 1.38 (0.77–2.47)
II (24.0-34.9) 1.00 II (20.1-28.9) 1.00
III (35.0-45.0) 1.16 (0.61–2.24) III (29.0-39.0) 1.26 (0.70–2.27)
IV (45.1-76.0) 1.12 (0.58–2.16) IV (39.1-64.3) 1.53 (0.85–2.74)
Smoking (pack-years*)
None 1.00 None 1.00
0.01-3.99 1.49 (0.79–2.82) 0.01-3.99 1.09 (0.66–1.82)
≥4.00 2.53 (1.08–5.97) ≥4.00 1.64 (0.70–3.84)
  1. # Metabolic equivalent (MET) hours per week calculated from physical activity outside school hours.
  2. * Years of smoking multiplied by the packs of cigarettes smoked daily.
  3. Numbers are cumulative odds ratios relative to reference (95% confidence intervals).