condition mean min max ZT0-3 12.032405 12.032405 12.032405 ZT4-7 12.91299 12.91299 12.91299 ZT8-11 12.8295065 12.8295065 12.8295065 ZT12-15 12.36481 12.36481 12.36481 ZT16-19 13.1214505 13.1214505 13.1214505 ZT20-23 12.717772499999999 12.717772499999999 12.717772499999999