condition mean min max ZT0-3 5.18273 3.60144 6.76402 ZT4-7 3.65489 3.65489 3.65489 ZT8-11 3.761375 3.761375 3.761375 ZT12-15 0 0 0 ZT16-19 8.120095 8.120095 8.120095 ZT20-23 8.102895 8.102895 8.102895