condition mean min max ZT0-3 9.368883 9.368883 9.368883 ZT4-7 9.3497895 9.3497895 9.3497895 ZT8-11 9.9418565 9.9418565 9.9418565 ZT12-15 8.485839 8.485839 8.485839 ZT16-19 9.361751 9.361751 9.361751 ZT20-23 10.4270855 10.4270855 10.4270855