condition mean min max ZT0-3 13.0365 13.0365 13.0365 ZT4-7 12.51975 12.51975 12.51975 ZT8-11 10.711665 10.711665 10.711665 ZT12-15 8.05247 8.05247 8.05247 ZT16-19 12.79075 12.79075 12.79075 ZT20-23 12.4391 12.4391 12.4391