Inverted L-shape association between a body shape index and peak expiratory flow among middle-aged and older adults: findings from the China Health and Retirement Longitudinal Study (CHARLS)

Jiang, Guosong; Feng, Licheng; Qu, Xiaoxiao; Wang, Jia; Li, Yun

doi:10.1186/s12944-025-02599-2

Lipids in Health and Disease

Table 3 Association of ABSI and PEF/PEF _prediction (Multiple imputation)

From: Inverted L-shape association between a body shape index and peak expiratory flow among middle-aged and older adults: findings from the China Health and Retirement Longitudinal Study (CHARLS)

	Categories	Model 1		Model 2		Model 3		Model 4
	Categories	β(95%CI)	P value	β(95%CI)	P value	β(95%CI)	P value	β(95%CI)	P value
All	ABSI**	−2.08 (−2.78 ~ −1.38)	< 0.001	−3.12 (−3.98 ~ −2.27)	< 0.001	−3.16 (−4.13 ~ −2.20)	< 0.001	−3.16 (−4.21 ~ −2.10)	< 0.001
	ABSI** Quintile
	Q1 (1.70 ~ 6.86)	0(Ref)		0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)
	Q2 (6.86 ~ 7.18)	−0.49 (−1.87 ~ 0.89)	0.486	−0.61 (−2.03 ~ 0.82)	0.403	−0.50 (−2.10 ~ 1.09)	0.537	−0.30 (−2.02 ~ 1.43)	0.734
	Q3 (7.18 ~ 7.46)	−0.63 (−2.01 ~ 0.75)	0.368	−2.33 (−3.83 ~ −0.83)	0.002	−1.83 (−3.51 ~ −0.15)	0.033	−1.70 (−3.52 ~ 0.12)	0.068
	Q4 (7.46 ~ 7.76)	0.23 (−1.15 ~ 1.61)	0.739	−2.64 (−4.26 ~ −1.02)	0.001	−2.36 (−4.17 ~ −0.54)	0.011	−2.90 (−4.88 ~ −0.91)	0.004
	Q5 (7.76 ~ 11.40)	−3.63 (−5.01 ~ −2.25)	< 0.001	−6.06 (−7.79 ~ −4.33)	< 0.001	−5.84 (−7.78 ~ −3.90)	< 0.001	−5.81 (−7.95 ~ −3.67)	< 0.001
	P for trend		< 0.001		< 0.001		< 0.001		< 0.001
Male
	ABSI**	−4.01 (−5.30 ~ −2.71)	< 0.001	−3.35 (−4.73 ~ −1.96)	< 0.001	−3.25 (−4.83 ~ −1.67)	< 0.001	−3.30 (−5.05 ~ −1.55)	< 0.001
	ABSI** Quintile
	Q1 (2.31 ~ 7.29)	0(Ref)		0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)
	Q2 (7.29 ~ 7.51)	1.77 (−0.32 ~ 3.85)	0.097	1.46 (−0.70 ~ 3.63)	0.186	1.35 (−1.14 ~ 3.84)	0.287	1.07 (−1.62 ~ 3.76)	0.436
	Q3 (7.51 ~ 7.71)	1.03 (−1.06 ~ 3.12)	0.333	0.94 (−1.23 ~ 3.10)	0.396	0.74 (−1.74 ~ 3.22)	0.561	−0.32 (−3.04 ~ 2.41)	0.819
	Q4 (7.71 ~ 7.93)	0.71 (−1.38 ~ 2.79)	0.506	0.38 (−1.80 ~ 2.56)	0.733	−0.34 (−2.85 ~ 2.17)	0.789	−0.98 (−3.75 ~ 1.78)	0.486
	Q5 (7.93 ~ 11.40)	−4.50 (−6.59 ~ −2.41)	< 0.001	−3.72 (−5.96 ~ −1.47)	0.001	−3.10 (−5.63 ~ −0.57)	0.016	−3.86 (−6.69 ~ −1.03)	0.008
	P for trend		< 0.001		0.002		0.008		0.003
Female
	ABSI**	−3.84 (−4.82 ~ −2.86)	< 0.001	−3.01 (−4.08 ~ −1.93)	< 0.001	−3.10 (−4.31 ~ −1.89)	< 0.001	−3.12 (−4.42 ~ −1.82)	< 0.001
	ABSI** Quintile
	Q1 (1.70 ~ 6.67)	0(Ref)		0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)
	Q2 (6.67 ~ 6.92)	0.45 (−1.37 ~ 2.26)	0.630	0.56 (−1.30 ~ 2.41)	0.556	0.29 (−1.80 ~ 2.39)	0.783	−0.09 (−2.34 ~ 2.15)	0.937
	Q3 (6.92 ~ 7.13)	−1.39 (−3.20 ~ 0.43)	0.134	−0.74 (−2.60 ~ 1.12)	0.435	−0.44 (−2.53 ~ 1.64)	0.678	−0.24 (−2.49 ~ 2.01)	0.837
	Q4 (7.13 ~ 7.40)	−2.42 (−4.24 ~ −0.61)	0.009	−2.47 (−4.37 ~ −0.57)	0.011	−1.72 (−3.83 ~ 0.40)	0.112	−1.98 (−4.28 ~ 0.31)	0.091
	Q5 (7.40 ~ 10.0)	−7.03 (−8.85 ~ −5.22)	< 0.001	−6.14 (−8.15 ~ −4.12)	< 0.001	−5.43 (−7.66 ~ −3.19)	< 0.001	−5.53 (−7.97 ~ −3.09)	< 0.001
	P for trend		< 0.001		< 0.001		< 0.001		< 0.001

ABSI a body shape index, PEF peak expiratory flow, PEF/PEF _prediction ratio of peak expiratory flow to predicted peak expiratory flow, TC total cholesterol, TG triglycerides, LDL low-density lipoprotein, β coefficient, CI confidence interval
Model 1: not adjusted
Model 2: adjusted for age, race, residence, educational status, marital status, sleep duration(total population adjusted for sex)
Model 3: adjusted for model 2, additionally adjusted for smoking status, drinking status, hypertension, diabetes, heart diseases, stroke, dyslipidemias, kidney diseases
Model 4: adjusted for model 3, additionally adjusted for creatinine, glucose, TC, TG, LDL, Cystatin C
^**Continuous variable: ABSI was scaled by a factor of 100

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