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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).