condition mean min max ZT0-3 12.685265 12.685265 12.685265 ZT4-7 13.346423 13.346423 13.346423 ZT8-11 11.484283000000001 11.484283000000001 11.484283000000001 ZT12-15 10.9240615 10.9240615 10.9240615 ZT16-19 12.378399 12.378399 12.378399 ZT20-23 12.0321205 12.0321205 12.0321205