condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0352214 0.0352214 0.0352214 ZT8-11 0.0 0.0 0.0 ZT12-15 0.03512395 0.03512395 0.03512395 ZT16-19 0.03114385 0.03114385 0.03114385 ZT20-23 0.01538465 0.01538465 0.01538465