condition mean min max ZT0-3 8.001351666666666 7.627600000000001 8.225159999999999 ZT4-7 5.56456 5.56456 5.56456 ZT8-11 9.960985 9.960985 9.960985 ZT12-15 10.110665000000001 8.27623 11.9451 ZT16-19 8.236045 8.236045 8.236045 ZT20-23 9.598665 9.598665 9.598665