condition mean min max ZT0-3 9.573865 9.573865 9.573865 ZT4-7 10.603408 10.603408 10.603408 ZT8-11 9.732966000000001 9.732966000000001 9.732966000000001 ZT12-15 8.8736295 8.8736295 8.8736295 ZT16-19 9.372301 9.372301 9.372301 ZT20-23 9.603538 9.603538 9.603538