condition mean min max ZT0-3 1.98834 1.98834 1.98834 ZT4-7 1.477495 1.477495 1.477495 ZT8-11 1.0993115 1.0993115 1.0993115 ZT12-15 1.602395 1.602395 1.602395 ZT16-19 2.6297 2.6297 2.6297 ZT20-23 1.96214 1.96214 1.96214