Skip to main content
. 2020 Oct;12(10):6379–6395. doi: 10.21037/jtd-19-crh-aq-007

Table 2. Univariate analysis of possible influencing factors of lung function.

Variables FVC (mL) FEV1 (mL) PEF (mL/s) FEV1/FVC (%)
β (95% CI) P value β (95% CI) P value β (95% CI) P value β (95% CI) P value
Height 32.37 (29.71, 35.04) <0.0001 29.31 (27.10, 31.53) <0.0001 51.42 (44.29, 58.55) <0.0001 0.01 (−0.06, 0.07) 0.8916
Weight 23.35 (20.52, 26.18) <0.0001 19.89 (17.42, 22.35) <0.0001 33.10 (26.04, 40.17) <0.0001 -0.05 (-0.11, 0.01) 0.1323
BMI 27.64 (19.88, 35.40) <0.0001 21.45 (14.69, 28.22) <0.0001 33.57 (15.68, 51.45) 0.0003 -0.15 (-0.30, 0.00) 0.0548
District
Urban (ref: suburban) −90.9 (−162.8, −19.0) 0.013 3.7 (−58.8, 66.2) 0.907 155.5 (−6.5, 317.5) 0.060 4.4 (3.1, 5.7) <0.001
Gender
   Female (ref: male) −172.75 (−236.57, −108.92) <0.0001 −134.69 (−190.16, −79.21) <0.0001 −399.07 (−542.48, −255.66) <0.0001 0.83 (−0.38, 2.05) 0.1794
Age (ref: 7 yr)
   8 89.12 (−45.23, 223.48) 0.1940 89.59 (−23.75, 202.93) 0.1218 445.81 (131.37, 760.26) 0.0056 0.76 (−2.07, 3.59) 0.5977
   9 260.65 (129.92, 391.39) 0.0001 234.36 (124.07, 344.64) <0.0001 665.90 (359.93, 971.86) <0.0001 0.48 (−2.27, 3.23) 0.7321
   10 469.09 (336.78, 601.40) <0.0001 412.48 (300.87, 524.10) <0.0001 905.56 (595.92, 1,215.21) <0.0001 0.05 (−2.74, 2.83) 0.9732
   11 612.07 (475.35, 748.79) <0.0001 592.33 (476.99, 707.66) <0.0001 1,337.57 (1,017.59, 1,657.56) <0.0001 2.20 (−0.68, 5.08) 0.1346
   12 604.11 (407.54, 800.67) <0.0001 569.18 (403.37, 735.00) <0.0001 1,663.54 (1,203.51, 2,123.58) <0.0001 2.53 (−1.61, 6.67) 0.2315
Parental smoking
   Yes (ref: no) −46.35 (−114.21, 21.51) 0.1812 −10.38 (−69.52, 48.76) 0.7310 60.37 (−92.54, 213.28) 0.4393 1.58 (0.30, 2.85) 0.0157
Sleep in own room
   No (ref: yes) −127.98 (−192.22, −63.74) 0.0001 −96.85 (−152.61, −41.09) 0.0007 −176.99 (−322.48, −31.49) 0.0174 0.60 (−0.62, 1.81) 0.3357
Sleep in own bed
   No (ref: yes) −107.88 (−177.39, −38.36) 0.0024 −93.14 (−153.33, −32.96) 0.0025 −258.35 (−414.56, −102.13) 0.0012 −0.28 (−1.59, 1.02) 0.6726
Kitchen style
   Open (ref: closed) 38.01 (−29.67, 105.69) 0.2714 50.77 (−7.75, 109.29) 0.0895 158.98 (7.08, 310.88) 0.0406 1.05 (−0.21, 2.31) 0.1039
Cook fuel
   Clear (ref: solid) 94.56 (−61.72, 250.84) 0.2361 53.14 (−82.21, 188.49) 0.4419 185.07 (−162.86, 532.99) 0.2975 −1.45 (−4.35, 1.46) 0.3300
Ventilation
   Yes (ref: no) 43.96 (−240.78, 328.69) 0.7623 28.65 (−217.87, 275.17) 0.8199 353.14 (−286.83, 993.12) 0.2798 −0.36 (−5.68, 4.96) 0.8951
Heating in winter
   No (ref: yes) 10.80 (−134.51, 156.12) 0.8842 −4.04 (−129.85, 121.76) 0.9498 −184.31 (−510.88, 142.27) 0.2691 0.01 (−2.70, 2.73) 0.9914
Heat fuel
   Coal (ref: none/central/gas/electricity) −19.21 (−106.42, 68.00) 0.6660 20.65 (−54.82, 96.11) 0.5920 170.02 (−24.83, 364.88) 0.0877 1.98 (0.35, 3.60) 0.0176
Air purifier
   No (ref: yes) −43.23 (−130.55, 44.08) 0.3321 −11.91 (−87.55, 63.73) 0.7576 −1.89 (−198.43, 194.65) 0.9850 1.17 (−0.46, 2.79) 0.1616
Keep pets
   Yes (ref: no) −101.89 (−201.49, −2.28) 0.0454 −36.71 (−123.15, 49.73) 0.4055 −20.63 (−245.33, 204.06) 0.8572 2.50 (0.64, 4.35) 0.0086
Mold recent one year
   Yes (ref: no) 75.69 (−104.23, 255.60) 0.4099 102.97 (−52.68, 258.61) 0.1952 117.54 (−287.27, 522.34) 0.5695 1.74 (−1.62, 5.10) 0.3110
Air fresher
   No (ref: yes) 89.98 (11.85, 168.11) 0.0243 67.41 (−0.29, 135.12) 0.0514 65.16 (−111.17, 241.49) 0.4691 −0.67 (−2.14, 0.79) 0.3687
Preterm birth
   No (ref: yes) 110.22 (−13.03, 233.47) 0.0801 116.43 (9.85, 223.02) 0.0326 248.95 (−28.28, 526.18) 0.0788 1.26 (−1.05, 3.56) 0.2858
Asthma recent
   Yes (ref: no) −72.98 (−374.74, 228.78) 0.6356 −142.16 (−403.23, 118.91) 0.2862 −281.23 (−959.78, 397.32) 0.4169 −3.49 (−9.12, 2.14) 0.2251
Pneumonia recent
   Yes (ref: no) 75.75 (−161.82, 313.32) 0.5322 25.37 (−180.36, 231.10) 0.8091 −74.35 (−608.86, 460.15) 0.7852 −3.01 (−7.44, 1.42) 0.1834
Allergy recent
   Yes (ref: no) −15.31 (−164.61, 133.98) 0.8407 −7.64 (−136.89, 121.61) 0.9078 34.36 (−301.46, 370.17) 0.8411 0.27 (−2.52, 3.06) 0.8481
Paternal occupation
   Non-manual laborer (ref: manual laborer) 102.68 (26.08, 179.29) 0.0088 77.13 (10.73, 143.53) 0.0231 73.21 (−99.87, 246.30) 0.4074 −0.87 (−2.30, 0.57) 0.2373
Maternal occupation
   Non-manual laborer (ref: manual laborer) 49.79 (−21.99, 121.57) 0.1744 17.17 (−45.05, 79.38) 0.5888 −21.68 (−183.35, 139.98) 0.7927 −1.45 (−2.79, −0.11) 0.0338
Paternal education
   Above/with senior high school (ref: below senior high school) 15.30 (−49.66, 80.26) 0.6444 −2.10 (−58.34, 54.15) 0.9417 −11.85 (−157.98, 134.28) 0.8738 −0.81 (−2.02, 0.41) 0.1926
Maternal education
   Above/with senior high school (ref: below senior high school) 13.41 (−51.49, 78.30) 0.6857 7.79 (−48.39, 63.98) 0.7858 45.86 (−100.10, 191.81) 0.5382 −0.21 (−1.42, 1.00) 0.7370
Breast feeding
   Yes (ref: no) 7.97 (−69.89, 85.84) 0.8410 −11.90 (−79.31, 55.50) 0.7293 −78.47 (−253.52, 96.58) 0.3799 −0.69 (−2.15, 0.76) 0.3491
Father had asthma
   Yes (ref: no) −65.48 (−387.85, 256.89) 0.6907 −92.88 (−371.91, 186.16) 0.5144 −448.96 (−1,173.39, 275.47) 0.2249 −2.20 (−8.22, 3.82) 0.4744
Mother had asthma
   Yes (ref: no) −18.49 (−444.05, 407.08) 0.9322 −33.19 (−401.61, 335.23) 0.8599 −475.72 (−1,432.30, 480.86) 0.3300 −1.73 (−9.68, 6.21) 0.6694
Vegetable frequency
   Above/with reference (ref: below reference) 42.38 (−23.45, 108.21) 0.2075 17.62 (−39.53, 74.77) 0.5459 −42.61 (−191.15, 105.93) 0.5741 −0.98 (−2.22, 0.25) 0.1200
Fruit frequency
   Above/with reference (ref: below reference) 63.26 (−2.39, 128.91) 0.0594 49.91 (−7.06, 106.87) 0.0864 56.55 (−91.76, 204.86) 0.4551 −0.28 (−1.52, 0.96) 0.6578
Dairy frequency
   Above/with reference (ref: below reference) 12.72 (−62.16, 87.59) 0.7393 16.11 (−48.82, 81.04) 0.6270 90.56 (−78.08, 259.21) 0.2929 −0.12 (−1.53, 1.29) 0.8698
Fish products
   Above/with reference (ref: below reference) 42.71 (−93.47, 178.88) 0.5390 39.15 (−79.00, 157.30) 0.5162 81.19 (−226.45, 388.83) 0.6051 0.13 (−2.43, 2.70) 0.9183
High fat and calorie products
   Sometimes (ref: never) −11.36 (−83.88, 61.15) 0.7588 9.68 (−53.29, 72.65) 0.7632 59.70 (−103.81, 223.21) 0.4745 0.88 (−0.48, 2.24) 0.2053
Sports activities
   Yes (ref: no) 46.07 (−44.29, 136.42) 0.3180 12.83 (−65.45, 91.11) 0.7480 −136.37 (−339.49, 66.76) 0.1887 −1.15 (−2.83, 0.53) 0.1806
Sweat after sports activities
   More (ref: less) 112.26 (40.77, 183.76) 0.0022 83.92 (22.44, 145.40) 0.0077 174.13 (13.38, 334.88) 0.0342 −0.95 (−2.31, 0.42) 0.1743