condition mean min max ZT0-3 9.900412 9.900412 9.900412 ZT4-7 10.1225585 10.1225585 10.1225585 ZT8-11 9.617553000000001 9.617553000000001 9.617553000000001 ZT12-15 10.4876595 10.4876595 10.4876595 ZT16-19 10.2368265 10.2368265 10.2368265 ZT20-23 10.023259 10.023259 10.023259