Table 4. Adolescent hormone levels by birth size among 62 Norwegian girls in the follicular phasea of the menstrual cycle.

		Geometric meanb (95 % CI)
Variables	No. of girls	Free testosterone index	Androstenedione (nmol l−1)	Estradiol (nmol l−1)
Birth length (cm)
<49.0	26	2.16 (1.61–2.90)	8.0 (7.1–9.1)	0.08 (0.05–0.12)
49.0–51.0	17	2.17 (1.50–3.13)	8.2 (7.1–9.6)	0.10 (0.06–0.17)
⩾51.0	19	2.15 (1.53–3.02)	8.2 (7.1–9.4)	0.12 (0.07–0.19)
Trend testc		eβ=1.00, P=0.98	eβ=1.01, P=0.81	eβ=1.24, P=0.17
Birth weight (g)
<3200	26	2.01 (1.52–2.66)	7.9 (7.0–8.9)	0.08 (0.05–0.12)
3200–3700	21	2.64 (1.93–3.61)	8.4 (7.4–9.6)	0.10 (0.06–0.16)
⩾3700	15	1.83 (1.26–2.67)	8.3 (7.1–9.7)	0.13 (0.07–0.21)
Trend testc		eβ=0.98, P=0.90	eβ=1.03, P=0.54	eβ=1.28, P=0.14
Ponderal index (g cm−3)
<2.63	24	2.04 (1.53–2.72)	8.2 (7.2–9.2)	0.08 (0.05–0.13)
2.63–2.85	18	2.63 (1.84–3.77)	7.8 (6.7–9.1)	0.10 (0.06–0.17)
⩾2.85	20	1.98 (1.42–2.75)	8.4 (7.3–9.6)	0.11 (0.07–0.18)
Trend testc		eβ=0.99, P=0.92	eβ=1.01, P=0.82	eβ=1.15, P=0.39
Head circumference (cm)
<34.2	24	2.03 (1.51–2.72)	7.8 (6.9–8.8)	0.09 (0.06–0.15)
34.2–35.4	23	2.34 (1.68–3.24)	8.1 (7.1–9.2)	0.09 (0.06–0.15)
⩾35.4	14	2.12 (1.44–3.12)	8.8 (7.5–10.3)	0.10 (0.06–0.17)
Trend testc		eβ=1.03, P=0.78	eβ=1.06, P=0.23	eβ=1.01, P=0.94
Skin-fold thickness (mm)
<3.8	25	2.19 (1.64–2.91)	8.2 (7.2–9.2)	0.07 (0.05–0.11)
3.8–4.8	21	1.62 (1.16–2.27)	7.4 (6.4–8.5)	0.11 (0.07–0.17)
⩾4.8	14	2.99 (2.02–4.44)	9.2 (7.7–10.8)	0.14 (0.08–0.25)
Trend testc		eβ=1.13, P=0.33	eβ=1.05, P=0.40	eβ=1.43, P=0.049

CI=confidence interval.

^aGirls who were measured between day 1 and day 12 of their menstrual cycle and who had LH<10 U l⁻¹, 17-OH-progesterone <10 nmol l⁻¹ and progesterone <5 nmol l⁻¹.

^bAdjusted for age at puberty, time since menarche, day of menstrual cycle and district.

^ce^β × 100% equals percent change in hormone levels with increasing birth size category and corresponding P-value.