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Table 1 Characteristics prior to study entry

From: Evaluation of the effects of an offer of a monetary incentive on the rate of questionnaire return during follow-up of a clinical trial: a randomised study within a trial

Characteristic First mailout (n = 503) Reminder (n = 515)
n (%) n (%)
Maternal age (years) - mean {SD}
 Under 20
 20–24
 25–29
 30–34
 35–39
 40+
28.9
24
93
133
177
66
10
{5.6}
(4.8)
(18.5)
(26.4)
(35.2)
(13.1)
(2.0)
29.3
24
79
148
180
71
13
{5.5}
(4.7)
(15.3)
(28.7)
(35.0)
(13.8)
(2.5)
Gestational age at entry (weeks) - mean {SD}
 37+0 – 39+6
 40+0 – 41+6
 42+0 or above
40.4
150
320
32
{1.2}
(29.9)
(63.8)
(6.4)
40.3
167
315
32
{1.2}
(32.5)
(61.3)
(6.2)
Index of Multiple Deprivation – quintile     
 1st (Least deprived)
 2nd
 3rd
 4th
 5th (Most deprived)
 Wales – not derived
 Postcode missing
64
72
83
112
95
66
11
(15.0)
(16.9)
(19.5)
(26.3)
(22.3)
72
63
91
129
88
59
13
(16.3)
(14.2)
(20.5)
(29.1)
(19.9)
Ethnic group:     
 White
 Indian
 Pakistani
 Bangladeshi
 Black African
 Black Caribbean
 Any other ethnic group
 Not known/missing
415
20
9
2
14
7
29
7
(83.7)
(4.0)
(1.8)
(0.4)
(2.8)
(1.4)
(5.9)
434
14
7
1
10
2
42
5
(85.1)
(2.8)
(1.4)
(0.2)
(2.0)
(0.4)
(8.2)
BMI (at booking visit)     
 - mean {SD}
 Height and/or weight not known
25.2
18
{5.2} 25.2
11
{5.3}
Onset of labour:     
 Spontaneous
 Induced
309
193
(61.6)
(38.5)
293
222
(56.9)
(43.1)
Diagnosis of pre-eclampsia 12 (2.4) 22 (4.3)
Diagnosis of delay requiring intervention 266 (53.1) 272 (52.8)
Systemic opioids given prior to epidural
 Pethidine
 Diamorphine
 Remifentanil
 Morphine
 Meptid
142
103
38
0
0
3
(28.3)
(72.5)
(26.8)
(0.0)
(0.0)
(2.1)
137
97
38
1
0
3
(26.6)
(70.8)
(27.7)
(0.7)
(0.0)
(2.2)
Epidural technique:     
 Epidural
 Combined spinal epidural
485
17
(96.6)
(3.4)
496
18
(96.5)
(3.5)
Woman’s pain score for last contraction - median [IQR]
Missing
10
59
[0 to 32] 10
55
[0 to 30]
Able to perform straight leg raise
Missing
381
29
(80.4) 408
22
(82.8)
Spontaneous vaginal birth 197 (39.2) 181 (35.2)
  1. SD standard deviation, IQR interquartile range
  2. Missing data are <1 % unless otherwise presented
  3. Values are numbers (percentages) unless stated otherwise