condition mean min max ZT0-3 32.9096 32.9096 32.9096 ZT4-7 30.7009 30.7009 30.7009 ZT8-11 23.281599999999997 23.281599999999997 23.281599999999997 ZT12-15 25.1236 25.1236 25.1236 ZT16-19 30.152099999999997 30.152099999999997 30.152099999999997 ZT20-23 33.59365 33.59365 33.59365