condition mean min max ZT0-3 5.9148016666666665 5.22483 6.611475 ZT4-7 5.592115 5.592115 5.592115 ZT8-11 5.516285 5.516285 5.516285 ZT12-15 7.4464274999999995 7.18676 7.7060949999999995 ZT16-19 6.045249999999999 6.045249999999999 6.045249999999999 ZT20-23 7.861610000000001 7.861610000000001 7.861610000000001