condition mean min max ZT0-3 9.286675 9.286675 9.286675 ZT4-7 9.842257 9.842257 9.842257 ZT8-11 10.402591000000001 10.402591000000001 10.402591000000001 ZT12-15 9.6798635 9.6798635 9.6798635 ZT16-19 9.9942145 9.9942145 9.9942145 ZT20-23 9.788547 9.788547 9.788547