Skip to main content

Table 1 Demographic variables of the participants

From: Association of peripheral BDNF level with cognition, attention and behavior in preschool children

  Boys (n = 13) Girls (n = 15) Total (n = 28)
Age range 5.11–6.80 5.10–7.00 5.10–7.00
Age mean (SD) 6.12 (0.55) 6.19 (0.66) 6.16 (0.60)
Maternal age at pregnancy 29.54 (2.30) 29.73 (3.70) 29.65 (3.07)
Birth weight 3.23 (0.56) 3.04 (0.49) 3.13 (0.52)
Paternal education (n, %)
 12 years 3 (23.1) 3 (20.0) 6 (21.4)
 13–16 years 8 (61.5) 12 (80.0) 20 (71.4)
 Above 16 years 2 (15.4) 0 2 (7.2)
Maternal education (n, %)
 12 years 2 (15.4) 2 (13.3) 4 (14.3)
 13–16 years 8 (61.5) 13 (86.7) 21 (75.0)
 Above 16 years 3 (23.1) 0 3 (10.7)
Income (n, %)
 1–3 million/month 3 (23.1) 4 (26.7) 7 (25.0)
 3–5 million/month 8 (61.5) 9 (60.0) 17 (60.7)
 Above 5 million/month 2 (15.4) 2 (13.3) 4 (14.3)
Indirect smoking
 Yes (n, %) 8 (61.5) 9 (60.0) 17 (60.7)
Serum BDNF level mean (SD) (pg/ml)
 Age 5–6 24,063.33 (10463.72) 21,680.00 (6081.51) 22,871.67 (8253.99)
 Age 6–7 19,562.14 (4843.85) 24,938.33 (10309.37) 22,586.25 (8582.34)
Plasma BDNF level mean (SD) (pg/ml)
 Age 5–6 2546.08 (1971.05) 2827.75 (1725.49) 2686.92 (1772.26)
 Age 6–7 2728.82 (1605.08) 3205.25 (1682.22) 2996.81 (1612.25)