condition mean min max ZT0-3 0.55614625 0.4429435 0.669349 ZT4-7 0.3352905 0.3352905 0.3352905 ZT8-11 0.16705 0.16705 0.16705 ZT12-15 0 0 0 ZT16-19 0.3843295 0.3843295 0.3843295 ZT20-23 0.549491 0.549491 0.549491