condition mean min max ZT0-3 11.4555 11.4555 11.4555 ZT4-7 9.740435 9.740435 9.740435 ZT8-11 6.62196 6.62196 6.62196 ZT12-15 9.60106 9.60106 9.60106 ZT16-19 8.60063 8.60063 8.60063 ZT20-23 9.893805 9.893805 9.893805