Is it possible to estimate the minimal clinically important treatment effect needed to change practice in preterm birth prevention? Results of an obstetrician survey used to support the design of a trial

Table 1 Characteristics of respondents

Characteristic	Unit/details	Description (n = 544)	# missing
Age	mean years	46 (SD 10)	9
Time in practice	mean years	15 (SD 10)	4
Gender	male female	272 (50.6%) 266 (49.4%)	6
Practice setting	urban/suburban small town/rural	428 (80.0%) 107 (20.0%)	9
Hospital	teaching community other	283 (52.2%) 232 (42.8%) 27 (5.0%)	2