condition mean min max ZT0-3 8.34685 5.5596 11.1341 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 21.9314 21.9314 21.9314