Table 3 QR results for assessing the relationship between different IPI and birth weight for the women after a pregnancy termination.

From: Association between maternal interpregnancy interval after live birth or pregnancy termination and birth weight: a quantile regression analysis

IPI

Coeff (p-value)

(95% CI)

Q05

Q10

Q25

Q50

Q75

Q90

Q95

OLS

<12 months

(n = 1413)

−10.00(0.8464)

(−111.21~91.21)

−50.00(0.2285)

(−131.39~31.39)

−25.00(0.4172)

(−85.40~35.40)

−50.00(0.1762)

(−122.46~22.46)

−85.00(0.0274)

(−160.51~−9.49)

−44.00(0.3163)

(−130.07~42.07)

−75.00(0.2037)

(−190.67~40.67)

−47.89(0.0980)

(−104.62~8.83)

12~17 months

(n = 439)

20.00(0.742)

(−99.12~139.12)

0.00(1.0000)

(−95.79~95.79)

0.00(1.0000)

(−71.09~71.09)

−50.00(0.2504)

(−135.28~35.28)

−85.00(0.0608)

(−173.87~3.87)

−69.00(0.1818)

(−170.30~32.30)

−84.14(0.2257)

(−220.28~51.99)

−36.11(0.2891)

(−102.87~30.66)

18~23 months

(n = 303)

Ref.

24~35 months

(n = 435)

25.00(0.6807)

(−94.11~144.11)

0.00(1.0000)

(−95.78~95.78)

0.00(1.0000)

(−71.09~71.09)

0.00(1.0000)

(−85.28~85.28)

−60.00(0.1856)

(−148.86~28.86)

−39.00(0.4504)

(−140.29~62.29)

−75.00(0.2801)

(−211.13~61.13)

−16.88(0.6201)

(−83.64~49.88)

36~47 months

(n = 248)

−65.00(0.3506)

(−201.51~71.51)

−150.00(0.0074)

(−259.78~−40.22)

−50.00(0.2290)

(−131.47~31.47)

−50.00(0.3159)

(−147.74~47.74)

−29.37(0.5718)

(−131.21~72.47)

−8.00(0.8925)

(−124.09~108.09)

0.00(1.0000)

(−156.01~156.01)

−53.21(0.1728)

(−129.72~23.30)

48~59 months

(n = 166)

−125.00(0.112)

(−279.16~29.16)

0.00(1.0000)

(−123.96~123.96)

−25.00(0.5942)

(−117.00~67.00)

−100.00(0.0757)

(−210.37~10.37)

−35.00(0.5507)

(−150.00~80.00)

−19.00(0.7763)

(−150.09~112.09)

25.00(0.7809)

(−151.18~201.18)

−30.74(0.4855)

(−117.14~55.66)

60~119 months

(n = 321)

90.00(0.1732)

(−39.53~219.53)

0.00(1.0000)

(−104.16~104.16)

25.00(0.5261)

(−52.30~102.30)

0.00(1.0000)

(−92.73~92.73)

−50.00(0.3104)

(−146.63~46.63)

−62.00(0.2698)

(−172.15~48.15)

−30.00(0.6911)

(−178.03~118.03)

−12.27(0.7404)

(−84.86~60.33)

>119 months

(n = 75)

90.00(0.4105)

(−124.39~304.39)

−50.00(0.5696)

(−222.40~122.40)

−25.00(0.7017)

(−152.95~102.95)

−150.00(0.0554)

(−303.49~3.49)

−15.00(0.8541)

(−174.94~144.94)

145.00(0.1190)

(−37.32~327.32)

330.00(0.0083)

(84.99~575.01)

−19.56(0.7497)

(−139.72~100.60)

  1. OLS: ordinary least squares; Q: quantile;
  2. Adjust covariates: Residence, Infant gender, Gestational age, Maternal age, Maternal education, Ethnicity, Gravidity, Maternal job, PIH and Economic status.
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