condition mean min max ZT0-3 155.787626 155.787626 155.787626 ZT4-7 82.293767 82.293767 82.293767 ZT8-11 111.7838045 111.7838045 111.7838045 ZT12-15 189.65482749999998 189.65482749999998 189.65482749999998 ZT16-19 111.4223395 111.4223395 111.4223395 ZT20-23 136.9728135 136.9728135 136.9728135