condition mean min max ZT0-3 0.417285 0.3571355 0.4774345 ZT4-7 0.3647465 0.3647465 0.3647465 ZT8-11 0.489381 0.489381 0.489381 ZT12-15 0 0 0 ZT16-19 0.5070705 0.5070705 0.5070705 ZT20-23 0.5381355 0.5381355 0.5381355