Table 1 Description characteristics and comparison between LDCT and CDCT
LDCT group | CDCT group | t or Z | P | |
|---|---|---|---|---|
26 ~ 30 Years old (n) | 21 | 32 | ||
age (years) | 28.43 ± 1.21 | 28.16 ± 1.25 | 0.787 | 0.435 |
BMI (kg/m2) | 21.41 ± 2.77 | 20.81 ± 3.22 | 0.705 | 0.484 |
vBMD (mg/cm3) | 184.26 ± 21.71 | 181.77 ± 29.96 | 0.328 | 0.744 |
mAs | 16.00 (14.00, 21.00) | 90.00 (61.25, 116.00) | -5.795 | < 0.001 |
CTDIvol (mGy) | 1.12 (0.96, 1.47) | 6.10 (4.18, 7.85) | -5.793 | < 0.001 |
DLP (mGy·cm) | 45.70 (33.00, 54.30) | 227.05 (165.35, 297.78) | -6.111 | < 0.001 |
ED (mSv) | 0.63 ± 0.16 | 3.26 ± 1.14 | -12.886 | < 0.001 |
31 ~ 35 Years old (n) | 98 | 80 | ||
age (years) | 33.21 ± 1.36 | 33.48 ± 1.39 | -1.259 | 0.210 |
BMI (kg/m2) | 21.49 ± 2.65 | 22.99 ± 3.63 | -3.101 | 0.002 |
vBMD (mg/cm3) | 183.17 ± 27.66 | 180.27 ± 26.71 | 0.708 | 0.480 |
mAs | 17.00 (13.75, 20.00) | 94.50 (77.00, 124.25) | -11.466 | < 0.001 |
CTDIvol (mGy) | 1.15 (0.95, 1.38) | 6.41(5.23, 8.41) | -11.459 | < 0.001 |
DLP (mGy·cm) | 43.50 (36.10, 53.25) | 241.45(186.50, 309.48) | -11.463 | < 0.001 |
ED (mSv) | 0.64 ± 0.15 | 3.45 ± 1.31 | -19.017 | < 0.001 |
36 ~ 40 Years old (n) | 56 | 53 | ||
age (years) | 37.86 ± 1.52 | 38.15 ± 1.41 | -1.046 | 0.298 |
BMI (kg/m2) | 22.31 ± 2.66 | 23.29 ± 3.64 | -1.598 | 0.113 |
vBMD (mg/cm3) | 181.15 ± 26.78 | 181.13 ± 33.13 | 0.004 | 0.997 |
mAs | 20.00 (17.00, 22.00) | 88.00 (59.50, 117.00) | -9.013 | < 0.001 |
CTDIvol (mGy) | 1.31 (1.20, 1.52) | 5.96 (4.06, 7.93) | -8.998 | < 0.001 |
DLP (mGy·cm) | 50.05 (44.33, 56.80) | 225.40 (147.75, 291.10) | -8.997 | < 0.001 |
ED (mSv) | 0.69 ± 0.15 | 3.21 ± 1.47 | -12.452 | < 0.001 |
41 ~ 45 Years old (n) | 41 | 35 | ||
age (years) | 42.54 ± 1.45 | 43.57 ± 1.17 | -3.383 | 0.001 |
BMI (kg/m2) | 23.13 ± 2.38 | 22.62 ± 2.74 | 0.857 | 0.394 |
vBMD (mg/cm3) | 182.94 ± 31.12 | 179.45 ± 28.84 | 0.504 | 0.616 |
mAs | 20.00 (15.00, 22.00) | 96.00 (88.00, 120.00) | -7.491 | < 0.001 |
CTDIvol (mGy) | 1.29 (1.07, 1.52) | 6.49 (5.96, 7.59) | -7.480 | < 0.001 |
DLP (mGy·cm) | 48.80 (41.00, 55.55) | 257.00(222.20, 306.30) | -7.478 | < 0.001 |
ED (mSv) | 0.69 ± 0.15 | 3.58 ± 0.97 | -17.361 | < 0.001 |