condition mean min max ZT0-3 1.4619116666666665 0.79957 2.747705 ZT4-7 1.52692 1.52692 1.52692 ZT8-11 1.608705 1.608705 1.608705 ZT12-15 0.4009225 0.0 0.801845 ZT16-19 0.3884485 0.3884485 0.3884485 ZT20-23 0.93079 0.93079 0.93079