condition mean min max ZT0-3 11.979225 11.979225 11.979225 ZT4-7 13.4214485 13.4214485 13.4214485 ZT8-11 12.981354 12.981354 12.981354 ZT12-15 12.182527499999999 12.182527499999999 12.182527499999999 ZT16-19 11.451181 11.451181 11.451181 ZT20-23 11.472476 11.472476 11.472476