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Variable Format Motivations Themes coded from open-ended questions, recoded as factor variable (1 = motivation mentioned, 0 = motivation not mentioned). Gender (female) Multiple choice (female, male, other), other responses dropped from analysis, recoded as a factor variable (female = 1, male = 0). Political views Likert scale 1 = very liberal, 7 = very conservative, continuous. Race (white) Multiple choice, recoded as a factor variable (white/Caucasian = 1, other categories = 0). Age Continuous number. Education Multiple choice, recoded as a factor variable (bachelor’s degree or higher = 1, other levels of education = 0). Income Multiple choice. Proportion of life in NYC Derived from years of life in NYC divided by age, continuous. People Respondents (%) New York Cityz (%) Gender Female persons 63.3 52.5 Male persons 36.7 47.5 Other 0.01 n/a Race and Hispanic Origin White 69.4 44 Black or African American 15.2 25.5 American Indian and Alaska Native 0.8 0.7 Asian alone 7.7 12.7 Native Hawaiian and Other Pacific Islander n/a 0.1 Two or more races n/a 4 Hispanic or Latino 6.9 28.6 Education High school graduate or higher, percent of persons age 25 years+, 2010–2014 99.6 80.1 Bachelor’s degree or higher, percent of persons age 25 years+, 2010–2014 86.8 35 ↵z New York City demographic data from 2010 Census.
Codes Definition Example quote Percent Count Values Identifying something as important “I think that the overall project for the continued greening of NYC is very important.” 29.1% 230 Contribute Making meaning in one’s life and the world around them “NYC has been caring for me, so I thought I’d give a little something back.” 19.6% 155 Educate / Learning Wanted to learn something “I love identifying and learning about trees, especially those in NYC. This event is a great way to keep learning and help an important effort at the same time.” 19.3% 153 Incentive Had an incentive to participate—extrinsic motivation “To earn concert tickets and to learn more about the tree census efforts of NYC and the neighborhoods in which they were occurring”z 11.9% 94 Fun / Enjoyment Sounded fun “A constructive/fun way to support the NYC environment.” 9.7% 77 Past Experience Already have volunteered, already have experience “I was proud to do it in 2005 and wanted to participate again.” 5.3% 42 Outdoors Wanted to be outdoors “I love being outside, and it seemed like a great way to get some sunshine and exercise while doing good!” 2.8% 22 Social / Meet People Meet new people, be around people/family “Learning experience and to meet someone new.” 2.3% 18 Total 100.0% 791 ↵z Afropunk offered free concert tickets to individuals who registered and attended a TC2015 event hosted within their TreesCount! adopted area.
- Table 4.
Logistic regression results (unstandardized coefficients and odds ratios) for each TC2015 motivation theme by demographic variables (n = 459).
Values Educate Contribute Fun Incentive Outdoors Past experience Social β Odds β Odds β Odds β Odds β Odds β Odds β Odds β Odds Intercept −0.86 0.42 −2.83z 0.06 −1.48 0.23 −4.50z 0.01 −1.17 0.31 −4.44y 0.12 −4.69y 0.01 −3.58 0.03 Gender (female) −0.15 0.99 0.38 1.46 0.43 1.04 0.47 1.60 −0.20 0.82 1.27 3.06 1.16 3.19 0.59 1.80 Political views −0.01 0.99 0.28y 1.32 0.15 1.16 −0.35 0.71 −0.12 0.89 0.57 1.78 −0.23 0.80 −0.47 0.63 Race (white) 0.32 1.38 0.32 1.38 0.01 1.01 0.00 1.00 −0.86y 0.42 0.77 2.17 −0.14 0.87 −0.01 0.99 Age 0.03x 1.03 −0.01 0.99 0.01 1.01 0.00 1.00 −0.02 0.98 −0.03 0.97 0.01 1.01 0.24 1.27 Education −0.13 0.88 0.35 1.41 −0.34 0.97 0.08 1.08 0.24 1.27 −0.07 0.93 0.48 1.61 −0.36 0.70 Income −0.05 0.95 −0.02 0.98 0.07 1.07 0.26y 1.30 −0.03 0.97 0.06 1.06 −0.22y 0.80 0.27 1.31 Proportion of life in NYC −0.21 0.81 −0.83 0.44 −1.41z 0.24 −0.01 0.99 0.95 2.59 −1.80 0.17 1.67y 5.29 0.15 1.16 Nagelkerke pseudo-R2 0.61 0.56 0.54 0.6 0.58 0.46 0.55 0.36 Goodness-of-fit test against null model (χ2) 17.42y 14.32y 12.58 11.62 16.09y 11.98 19.60z 5.11 n 459 459 459 459 459 459 459 459 - Table 5.
Wald test statistic for each TC2015 motivation theme logistic regression by demographic variables (n = 459).
Values Educate Contribute Fun Incentive Outdoors Past experience Social Gender (female) 0.00 1.69 0.25 1.36 0.34 2.45 3.22 0.71 Political views 0.00 3.94z 1.11 2.21 0.41 3.51 0.73 1.21 Race (white) 1.17 0.92 0.00 0.00 5.79z 0.84 0.07 0.08 Age 12.42y 0.49 0.57 0.07 3.58 1.21 0.66 0.15 Education 0.60 3.00 0.04 0.08 0.96 0.03 1.93 0.82 Income 0.81 0.13 1.20 5.55z 0.12 0.16 5.16z 2.22 Proportion of Life in NYC 0.30 3.65 9.79y 0.00 3.84z 2.65 5.27z 0.02 Theme Proportion of interviewees Average blocks mapped Median blocks mapped Minimum blocks mapped Maximum blocks mapped Past Experience 55% 147 36 1 1,109 Social / Meet People 48% 58 17 1 377 Values 38% 21 10 1 78 Contribute 23% 85 29 2 352 Explore 23% 256 77 4 1,109 Outdoors 15% 50 16 2 211 Educate / Learning 10% 36 19 2 102 Fun / Enjoyment 5% 69 69 17 120 Incentive 5% 15 15 4 25 - Table 7.
Comparison between motivations mentioned in initial assessment and in interviews (n = 40).
Contribute Educate Fun Incentive Outdoors Past experience Social Values Both 26 28 30 37 33 20 21 24 Initial only 7 9 7 2 1 0 0 11 Interview only 6 2 2 0 5 18 17 5 Not identified 1 1 1 1 1 2 2 0 Number of interviewees 40 40 40 40 40 40 40 40
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