Table 1 Descriptive statistics on the daily number of PTBs, temperature, relative humidity, wind, daily rain and dust code (2011–2017)
From: Environmental extreme temperature and daily preterm birth in Sabzevar, Iran: a time-series analysis
Variable | All PTBs | Temperature | Relative humidity | Average wind (mean ± SD) | Average rain (mean ± SD) | Average dust code (mean ± SD) | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Total number | Daily average ± SD | Average maximum temperature (mean ± SD) | Average minimum temperature (mean ± SD) | Average temperature (mean ± SD) | Average maximum RH (mean ± SD) | Average minimum RH (mean ± SD) | Average (mean ± SD) | ||||
Year | |||||||||||
2011 | 415 | 2.23 ± 1.81 | 28.24 ± 10.73 | 15.06 ± 9.01 | 28.24 ± 10.73 | 50.11 ± 24.58 | 19.35 ± 17.55 | 34.73 ± 20.14 | 8.13 ± 2.42 | 0.68 ± 2.84 | 0.68 ± 0.93 |
2012 | 513 | 1.95 ± 1.19 | 24.08 ± 11.29 | 11.44 ± 9.49 | 24.09 ± 11.29 | 55.00 ± 25.31 | 23.92 ± 17.53 | 39.46 ± 20.73 | 7.54 ± 2.51 | 0.54 ± 2.47 | 0.85 ± 0.92 |
2013 | 488 | 2.08 ± 1.18 | 25.77 ± 10.64 | 12.44 ± 9.42 | 25.77 ± 10.64 | 52.82 ± 23.10 | 20.20 ± 14.04 | 36.51 ± 17.72 | 8.03 ± 2.58 | 0.27 ± 1.75 | 0.69 ± 0.94 |
2014 | 448 | 2.03 ± 1.21 | 25.01 ± 11.45 | 12.04 ± 9.64 | 25.01 ± 11.45 | 53.16 ± 26.11 | 21.07 ± 16.15 | 37.12 ± 20.06 | 11.83 ± 3.79 | 0.44 ± 1.84 | 0.66 ± 0.97 |
2015 | 503 | 2.02 ± 1.03 | 25.59 ± 10.82 | 12.71 ± 9.10 | 25.59 ± 10.82 | 52.99 ± 23.83 | 22.34 ± 15.53 | 37.66 ± 19.05 | 11.85 ± 3.44 | 0.33 ± 1.42 | 1.13 ± 1.06 |
2016 | 518 | 2.21 ± 1.23 | 26.02 ± 10.26 | 12.68 ± 8.95 | 26.02 ± 10.26 | 53.53 ± 22.29 | 18.62 ± 12.15 | 36.08 ± 16.36 | 11.73 ± 3.52 | 0.37 ± 1.69 | 1.88 ± 1.03 |
2017 | 255 | 3.07 ± 1.55 | 22.73 ± 10.86 | 10.03 ± 9.15 | 22.73 ± 10.86 | 62.23 ± 21.93 | 22.82 ± 17.40 | 41.35 ± 19.53 | 11.72 ± 3.66 | 0.75 ± 2.81 | 2.56 ± 0.90 |
Month | |||||||||||
January | 286 | 2.27 ± 1.42 | 11.42 ± 4.32 | 0.41 ± 3.37 | 5.92 ± 3.54 | 75.06 ± 15.28 | 34.35 ± 13.48 | 54.71 ± 13.24 | 7.78 ± 2.94 | 0.50 ± 1.72 | 1.15 ± 1.09 |
February | 267 | 2.18 ± 1.28 | 13.11 ± 5.72 | 1.87 ± 4.57 | 7.49 ± 4.82 | 71.56 ± 16.46 | 33.71 ± 16.54 | 52.63 ± 15.63 | 9.02 ± 3.36 | 0.97 ± 3.18 | 1.30 ± 1.26 |
March | 263 | 2.07 ± 1.04 | 18.64 ± 5.16 | 6.47 ± 4.41 | 12.55 ± 4.45 | 70.23 ± 16.58 | 28.40 ± 13.41 | 49.31 ± 13.16 | 10.68 ± 3.93 | 0.75 ± 2.62 | 0.93 ± 0.99 |
April | 257 | 1.98 ± 1.13 | 26.19 ± 4.96 | 12.01 ± 3.89 | 19.09 ± 4.18 | 60.50 ± 19.49 | 19.11 ± 11.84 | 39.66 ± 14.65 | 11.27 ± 4.06 | 0.61 ± 2.15 | 0.87 ± 1.12 |
May | 216 | 1.86 ± 1.13 | 32.69 ± 3.62 | 18.26 ± 3.10 | 25.47 ± 3.15 | 50.18 ± 19.07 | 13.76 ± 7.97 | 31.43 ± 12.83 | 11.65 ± 3.94 | 0.61 ± 2.52 | 1.29 ± 1.16 |
June | 394 | 2.57 ± 1.24 | 37.24 ± 3.02 | 22.94 ± 2.85 | 30.08 ± 2.69 | 33.22 ± 14.06 | 9.35 ± 5.44 | 21.02 ± 9.10 | 11.94 ± 3.52 | 0.21 ± 1.75 | 1.67 ± 1.27 |
July | 369 | 2.72 ± 1.41 | 38.67 ± 2.56 | 24.97 ± 2.40 | 31.82 ± 2.25 | 27.79 ± 10.20 | 9.12 ± 3.95 | 18.45 ± 6.56 | 11.54 ± 3.25 | 0.04 ± 0.51 | 1.81 ± 1.07 |
August | 311 | 2.51 ± 1.95 | 37.03 ± 2.73 | 22.34 ± 2.60 | 29.69 ± 2.44 | 27.23 ± 10.35 | 9.16 ± 4.96 | 18.20 ± 7.22 | 10.77 ± 2.96 | 0.02 ± 0.29 | 1.35 ± 1.02 |
September | 208 | 1.67 ± 0.73 | 33.80 ± 3.20 | 19.09 ± 2.65 | 26.45 ± 2.70 | 34.95 ± 13.46 | 10.69 ± 5.48 | 22.82 ± 8.92 | 9.79 ± 2.80 | 0.08 ± 1.02 | 0.83 ± 0.96 |
October | 180 | 1.27 ± 0.51 | 26.19 ± 4.88 | 12.42 ± 3.84 | 19.30 ± 4.17 | 49.52 ± 17.84 | 18.32 ± 10.97 | 33.92 ± 13.56 | 9.47 ± 3.15 | 0.21 ± 1.14 | 0.48 ± 0.79 |
November | 176 | 1.80 ± 1.00 | 16.18 ± 5.27 | 5.28 ± 3.83 | 10.73 ± 4.22 | 70.88 ± 18.32 | 33.88 ± 18.03 | 52.38 ± 17.13 | 8.38 ± 3.50 | 0.90 ± 3.05 | 0.62 ± 0.98 |
December | 213 | 1.96 ± 1.37 | 11.48 ± 4.18 | 0.90 ± 3.54 | 6.19 ± 3.56 | 75.62 ± 16.66 | 36.75 ± 16.56 | 56.18 ± 15.57 | 7.59 ± 2.93 | 0.56 ± 2.47 | 0.99 ± 1.07 |
Day of week | |||||||||||
Sunday | 437 | 2.08 ± 1.23 | 25.23 ± 11.19 | 12.35 ± 9.39 | 18.79 ± 10.18 | 53.92 ± 24.54 | 21.52 ± 16.16 | 37.63 ± 19.62 | 10.05 ± 3.64 | 0.45 ± 1.84 | 1.12 ± 1.18 |
Monday | 434 | 2.16 ± 1.39 | 25.42 ± 11.14 | 12.31 ± 9.47 | 18.87 ± 10.21 | 53.22 ± 24.52 | 20.52 ± 15.66 | 36.79 ± 19.07 | 10.04 ± 3.90 | 0.43 ± 2.00 | 1.16 ± 1.31 |
Tuesday | 449 | 2.09 ± 1.08 | 25.48 ± 11.08 | 12.31 ± 9.38 | 18.90 ± 10.12 | 52.99 ± 24.12 | 21.07 ± 16.19 | 36.93 ± 19.35 | 10.02 ± 3.64 | 0.39 ± 1.91 | 1.12 ± 1.10 |
Wednesday | 485 | 2.29 ± 1.35 | 25.67 ± 10.95 | 12.55 ± 9.38 | 19.10 ± 10.06 | 54.48 ± 24.80 | 21.20 ± 16.06 | 37.72 ± 19.57 | 10.12 ± 3.92 | 0.79 ± 3.17 | 1.11 ± 1.12 |
Thursday | 447 | 2.08 ± 1.07 | 25.54 ± 10.66 | 12.56 ± 9.24 | 19.06 ± 9.87 | 54.58 ± 24.63 | 21.08 ± 14.98 | 37.72 ± 18.94 | 10.07 ± 3.84 | 0.34 ± 1.75 | 1.09 ± 1.14 |
Friday | 413 | 1.90 ± 0.90 | 25.52 ± 10.86 | 12.50 ± 9.23 | 19.01 ± 9.94 | 53.88 ± 23.68 | 21.30 ± 16.00 | 37.53 ± 19.01 | 10.15 ± 3.66 | 0.42 ± 2.07 | 0.99 ± 1.13 |
Saturday | 475 | 2.47 ± 1.94 | 25.41 ± 10.86 | 12.53 ± 9.39 | 18.96 ± 10.00 | 53.05 ± 23.14 | 21.13 ± 15.39 | 37.03 ± 18.45 | 9.91 ± 3.36 | 0.36 ± 1.51 | 1.18 ± 1.16 |
Holiday | |||||||||||
Yes | 631 | 1.96 ± 0.89 | 25.10 ± 10.76 | 12.14 ± 9.17 | 18.62 ± 9.85 | 54.96 ± 24.04 | 21.37 ± 15.95 | 38.11 ± 19.05 | 10.18 ± 3.72 | 0.48 ± 2.04 | 1.00 ± 1.11 |
No | 2509 | 2.21 ± 1.42 | 25.57 ± 11.00 | 12.52 ± 9.39 | 19.04 ± 10.09 | 53.40 ± 24.22 | 21.05 ± 15.72 | 37.13 ± 19.15 | 10.02 ± 3.71 | 0.45 ± 2.11 | 1.14 ± 1.14 |