condition mean min max ZT0-3 10.68674 10.68674 10.68674 ZT4-7 7.90751 7.90751 7.90751 ZT8-11 7.272755 7.272755 7.272755 ZT12-15 9.184995 9.184995 9.184995 ZT16-19 10.497710000000001 10.497710000000001 10.497710000000001 ZT20-23 10.374600000000001 10.374600000000001 10.374600000000001