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 2 Association of ABSI and PEF (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**	15.38 (12.13 ~ 18.63)	< 0.001	−6.28 (−9.56 ~ −3.00)	< 0.001	−6.22 (−9.87 ~ −2.57)	0.001	−6.15 (−10.13 ~ −2.17)	0.002
	ABSI** Quintile
	Q1 (1.70 ~ 6.86)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)
	Q2 (6.86 ~ 7.18)	5.11 (−1.22 ~ 11.44)	0.114	3.48 (−1.98 ~ 8.94)	0.211	3.09 (−2.95 ~ 9.12)	0.317	3.81 (−2.71 ~ 10.33)	0.252
	Q3 (7.18 ~ 7.46)	30.50 (24.17 ~ 36.83)	< 0.001	3.20 (−2.57 ~ 8.96)	0.277	3.76 (−2.60 ~ 10.12)	0.246	3.67 (−3.22 ~ 10.57)	0.296
	Q4 (7.46 ~ 7.76)	54.48 (48.15 ~ 60.81)	< 0.001	3.81 (−2.40 ~ 10.03)	0.229	3.90 (−2.94 ~ 10.75)	0.264	0.97 (−6.53 ~ 8.47)	0.799
	Q5 (7.76 ~ 11.40)	28.22 (21.89 ~ 34.55)	< 0.001	−13.19 (−19.83 ~ −6.55)	< 0.001	−13.36 (−20.68 ~ −6.03)	< 0.001	−13.81 (−21.91 ~ −5.71)	0.001
	P for trend		< 0.001		0.001		0.003		0.003
Male
	ABSI**	−35.17 (−41.35 ~ −28.99)	< 0.001	−10.62 (−16.6 ~ −4.64)	0.001	−10.03 (−16.73 ~ −3.33)	0.003	−9.83 (−17.26 ~ −2.40)	0.010
	ABSI** Quintile
	Q1 (2.31 ~ 7.29)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)
	Q2 (7.29 ~ 7.51)	8.58 (−1.34 ~ 18.50)	0.090	7.39 (−1.93 ~ 16.71)	0.120	6.87 (−3.68 ~ 17.42)	0.202	5.43 (−5.96 ~ 16.83)	0.350
	Q3 (7.51 ~ 7.71)	−0.52 (−10.44 ~ 9.40)	0.919	5.87 (−3.44 ~ 15.18)	0.216	4.71 (−5.81 ~ 15.24)	0.380	−0.21 (−11.76 ~ 11.34)	0.972
	Q4 (7.71 ~ 7.93)	−11.56 (−21.48 ~ −1.64)	0.022	4.64 (−4.76 ~ 14.04)	0.334	1.30 (−9.34 ~ 11.95)	0.810	−1.45 (−13.17 ~ 10.27)	0.809
	Q5 (7.93 ~ 11.40)	−52.89 (−62.81 ~ −42.97)	< 0.001	−12.84 (−22.51 ~ −3.17)	0.009	−10.71 (−21.45 ~ 0.03)	0.051	−13.32 (−25.32 ~ −1.31)	0.030
	P for trend		< 0.001		0.017		0.032		0.018
Female
	ABSI**	−28.89 (−32.18 ~ −25.60)	< 0.001	−7.19 (−10.59 ~ −3.78)	< 0.001	−6.98 (−10.76 ~ −3.19)	< 0.001	−6.80 (−10.89 ~ −2.71)	0.001
	ABSI** Quintile
	Q1 (1.70 ~ 6.67)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)	0(Ref)
	Q2 (6.67 ~ 6.92)	2.77 (−3.11 ~ 8.66)	0.356	2.77 (−3.11 ~ 8.66)	0.356	1.76 (−4.8 ~ 8.33)	0.598	0.60 (−6.44 ~ 7.65)	0.867
	Q3 (6.92 ~ 7.13)	−0.61 (−6.51 ~ 5.29)	0.840	−0.61 (−6.51 ~ 5.29)	0.840	0.36 (−6.18 ~ 6.89)	0.914	1.09 (−5.97 ~ 8.15)	0.762
	Q4 (7.13 ~ 7.40)	−5.53 (−11.56 ~ 0.50)	0.072	−5.53 (−11.56 ~ 0.50)	0.072	−2.90 (−9.53 ~ 3.72)	0.390	−3.44 (−10.64 ~ 3.76)	0.349
	Q5 (7.40 ~ 10.00)	−16.48 (−22.89 ~ −10.07)	< 0.001	−16.48 (−22.89 ~ −10.07)	< 0.001	−13.75 (−20.75 ~ −6.75)	< 0.001	−13.99 (−21.64 ~ −6.35)	< 0.001
	P for trend		< 0.001		< 0.001		< 0.001		< 0.001

ABSI a body shape index, PEF 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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