condition mean min max ZT0-3 8.273814999999999 8.273814999999999 8.273814999999999 ZT4-7 7.903740000000001 7.903740000000001 7.903740000000001 ZT8-11 9.62743 9.62743 9.62743 ZT12-15 9.647645 9.647645 9.647645 ZT16-19 9.86974 9.86974 9.86974 ZT20-23 7.685395 7.685395 7.685395