condition mean min max ZT0-3 12.0677 9.32845 14.80695 ZT4-7 6.966385 6.966385 6.966385 ZT8-11 5.357265 5.357265 5.357265 ZT12-15 0 0 0 ZT16-19 8.404575000000001 8.404575000000001 8.404575000000001 ZT20-23 9.661290000000001 9.661290000000001 9.661290000000001